diff --git a/eng/Versions.props b/eng/Versions.props
index 9d3af13f3369f7..56501855a088e8 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -74,6 +74,7 @@
     <MicrosoftNETCoreILAsmVersion>6.0.0-preview.5.21253.1</MicrosoftNETCoreILAsmVersion>
     <!-- Libraries dependencies -->
     <StyleCopAnalyzersVersion>1.2.0-beta.304</StyleCopAnalyzersVersion>
+    <SystemAppContextVersion>4.3.0</SystemAppContextVersion>
     <SystemBuffersVersion>4.5.1</SystemBuffersVersion>
     <SystemCollectionsVersion>4.3.0</SystemCollectionsVersion>
     <SystemCollectionsConcurrentVersion>4.3.0</SystemCollectionsConcurrentVersion>
@@ -81,6 +82,7 @@
     <SystemDataSqlClientVersion>4.8.1</SystemDataSqlClientVersion>
     <SystemDiagnosticsContractsVersion>4.3.0</SystemDiagnosticsContractsVersion>
     <SystemDiagnosticsDebugVersion>4.3.0</SystemDiagnosticsDebugVersion>
+    <SystemDiagnosticsToolsVersion>4.3.0</SystemDiagnosticsToolsVersion>
     <SystemDiagnosticsTracingVersion>4.3.0</SystemDiagnosticsTracingVersion>
     <SystemDynamicRuntimeVersion>4.3.0</SystemDynamicRuntimeVersion>
     <SystemLinqExpressionsVersion>4.3.0</SystemLinqExpressionsVersion>
@@ -88,6 +90,7 @@
     <SystemNetHttpVersion>4.3.4</SystemNetHttpVersion>
     <SystemNetPrimitivesVersion>4.3.1</SystemNetPrimitivesVersion>
     <SystemNumericsVectorsVersion>4.5.0</SystemNumericsVectorsVersion>
+    <SystemReflectionVersion>4.3.0</SystemReflectionVersion>
     <SystemReflectionMetadataVersion>5.0.0</SystemReflectionMetadataVersion>
     <SystemResourcesResourceManagerVersion>4.3.0</SystemResourcesResourceManagerVersion>
     <SystemRuntimeVersion>4.3.1</SystemRuntimeVersion>
diff --git a/src/libraries/System.Diagnostics.DiagnosticSource/ref/System.Diagnostics.DiagnosticSource.csproj b/src/libraries/System.Diagnostics.DiagnosticSource/ref/System.Diagnostics.DiagnosticSource.csproj
index 779380efcdefc9..983dd3b07d4c3a 100644
--- a/src/libraries/System.Diagnostics.DiagnosticSource/ref/System.Diagnostics.DiagnosticSource.csproj
+++ b/src/libraries/System.Diagnostics.DiagnosticSource/ref/System.Diagnostics.DiagnosticSource.csproj
@@ -3,12 +3,13 @@
     <TargetFrameworks>netstandard2.0;netstandard1.1;netstandard1.3;net45</TargetFrameworks>
     <CLSCompliant>false</CLSCompliant>
     <Nullable>enable</Nullable>
-    <AvoidRestoreCycleOnSelfReference>true</AvoidRestoreCycleOnSelfReference>
   </PropertyGroup>
   <!-- DesignTimeBuild requires all the TargetFramework Derived Properties to not be present in the first property group. -->
   <PropertyGroup>
     <ExcludeFromPackage Condition="'$(TargetFramework)' == 'netstandard2.0'">true</ExcludeFromPackage>
     <DefineConstants Condition="$(TargetFramework.StartsWith('net4'))">$(DefineConstants);ALLOW_PARTIALLY_TRUSTED_CALLERS</DefineConstants>
+    <!-- Avoid referencing NETStandard.Library on netstandard1.x since this package is part of that closure -->
+    <DisableImplicitFrameworkReferences Condition="'$(TargetFramework)' == 'netstandard1.1' or '$(TargetFramework)' == 'netstandard1.3'">true</DisableImplicitFrameworkReferences>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="System.Diagnostics.DiagnosticSource.cs" />
@@ -21,4 +22,7 @@
   <ItemGroup Condition="'$(TargetFramework)' == 'net45'">
     <Reference Include="System.Runtime" />
   </ItemGroup>
+  <ItemGroup Condition="'$(TargetFramework)' == 'netstandard1.1' or '$(TargetFramework)' == 'netstandard1.3'">
+    <PackageReference Include="System.Runtime" Version="$(SystemRuntimeVersion)" />
+  </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/src/libraries/System.Diagnostics.DiagnosticSource/src/System.Diagnostics.DiagnosticSource.csproj b/src/libraries/System.Diagnostics.DiagnosticSource/src/System.Diagnostics.DiagnosticSource.csproj
index ab2970430a42c3..25c8a38bc870dc 100644
--- a/src/libraries/System.Diagnostics.DiagnosticSource/src/System.Diagnostics.DiagnosticSource.csproj
+++ b/src/libraries/System.Diagnostics.DiagnosticSource/src/System.Diagnostics.DiagnosticSource.csproj
@@ -6,7 +6,6 @@
     <Nullable>enable</Nullable>
     <TargetFrameworks>$(NetCoreAppCurrent);net5.0;netstandard1.1;netstandard1.3;net45;net46;netstandard2.0</TargetFrameworks>
     <ExcludeCurrentNetCoreAppFromPackage>true</ExcludeCurrentNetCoreAppFromPackage>
-    <AvoidRestoreCycleOnSelfReference>true</AvoidRestoreCycleOnSelfReference>
   </PropertyGroup>
   <!-- DesignTimeBuild requires all the TargetFramework Derived Properties to not be present in the first property group. -->
   <PropertyGroup>
@@ -21,6 +20,8 @@
     <DefineConstants Condition="$(TargetFramework.StartsWith('net4'))">$(DefineConstants);ALLOW_PARTIALLY_TRUSTED_CALLERS;ENABLE_HTTP_HANDLER</DefineConstants>
     <ExcludeFromPackage Condition="'$(TargetFramework)' == 'netstandard2.0'">true</ExcludeFromPackage>
     <DefineConstants Condition="$([MSBuild]::GetTargetFrameworkIdentifier('$(TargetFramework)')) == '.NETCoreApp'">$(DefineConstants);W3C_DEFAULT_ID_FORMAT</DefineConstants>
+    <!-- Avoid referencing NETStandard.Library on netstandard1.x since this package is part of that closure -->
+    <DisableImplicitFrameworkReferences Condition="'$(TargetFramework)' == 'netstandard1.1' or '$(TargetFramework)' == 'netstandard1.3'">true</DisableImplicitFrameworkReferences>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="System\Diagnostics\DiagnosticSource.cs" />
@@ -100,6 +101,22 @@
     <Reference Include="System.Threading" />
     <Reference Include="System.Resources.ResourceManager" />
   </ItemGroup>
+  <ItemGroup Condition="'$(TargetFramework)' == 'netstandard1.1' or '$(TargetFramework)' == 'netstandard1.3'">
+    <PackageReference Include="System.Collections" Version="$(SystemCollectionsVersion)" />
+    <PackageReference Include="System.Collections.Concurrent" Version="$(SystemCollectionsConcurrentVersion)" />
+    <PackageReference Include="System.Diagnostics.Debug" Version="$(SystemDiagnosticsDebugVersion)" />
+    <PackageReference Include="System.Diagnostics.Tools" Version="$(SystemDiagnosticsToolsVersion)" />
+    <PackageReference Include="System.Diagnostics.Tracing" Version="$(SystemDiagnosticsTracingVersion)" />
+    <PackageReference Include="System.Reflection" Version="$(SystemReflectionVersion)" />
+    <PackageReference Include="System.Resources.ResourceManager" Version="$(SystemResourcesResourceManagerVersion)" />
+    <PackageReference Include="System.Runtime" Version="$(SystemRuntimeVersion)" />
+    <PackageReference Include="System.Runtime.InteropServices" Version="$(SystemRuntimeInteropServicesVersion)" />
+    <PackageReference Include="System.Threading" Version="$(SystemThreadingVersion)" />
+  </ItemGroup>
+  <ItemGroup Condition="'$(TargetFramework)' == 'netstandard1.3'">
+    <PackageReference Include="System.AppContext" Version="$(SystemAppContextVersion)" />
+    <PackageReference Include="System.Runtime.Extensions" Version="$(SystemRuntimeExtensionsVersion)" />
+  </ItemGroup>
   <ItemGroup Condition="'$(TargetFramework)' != 'netstandard1.1' and
                         $([MSBuild]::GetTargetFrameworkIdentifier('$(TargetFramework)')) != '.NETCoreApp'">
     <PackageReference Include="System.Memory" Version="$(SystemMemoryVersion)" />
diff --git a/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj b/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj
index aed036f572e6de..14050c3272f902 100644
--- a/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj
+++ b/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj
@@ -7,10 +7,13 @@
     <DebugOptimization Condition="'$(Configuration)' == 'Release'">OPT</DebugOptimization>
     <CoreCompileDependsOn>$(CoreCompileDependsOn);GenerateVersionFile</CoreCompileDependsOn>
     <DocumentationFile>$(MSBuildThisFileDirectory)System.Runtime.CompilerServices.Unsafe.xml</DocumentationFile>
-    <ExtraMacros Condition="'$(TargetFramework)' == '$(NetCoreAppCurrent)' or '$(TargetFramework)' == 'netcoreapp2.0'">#define netcoreapp</ExtraMacros>
     <IlasmFlags>$(IlasmFlags) -DEBUG=$(DebugOptimization)</IlasmFlags>
+  </PropertyGroup>
+  <PropertyGroup>
+    <ExtraMacros Condition="'$(TargetFramework)' == '$(NetCoreAppCurrent)' or '$(TargetFramework)' == 'netcoreapp2.0'">#define netcoreapp</ExtraMacros>
     <CoreAssembly>System.Runtime</CoreAssembly>
     <CoreAssembly Condition="'$(TargetFramework)' == 'netstandard2.0'">netstandard</CoreAssembly>
+    <DisableImplicitFrameworkReferences Condition="'$(TargetFramework)' == 'netstandard1.0'">true</DisableImplicitFrameworkReferences>
   </PropertyGroup>
   <PropertyGroup Condition="$(TargetFramework.StartsWith('net4'))">
     <CoreAssembly>mscorlib</CoreAssembly>
@@ -23,6 +26,9 @@
     <!-- mscorlib is passed in as an explicit reference from C# targets but not via the IL SDK. -->
     <Reference Include="$(CoreAssembly)"
                Condition="!$(TargetFramework.StartsWith('netstandard'))" />
+
+    <PackageReference Include="System.Runtime" Version="$(SystemRuntimeVersion)"
+                      Condition="'$(TargetFramework)' == 'netstandard1.0'" />
   </ItemGroup>
 
   <Target Name="GenerateVersionFile"