diff --git a/src/Umbraco.Core/Collections/CompositeIntStringKey.cs b/src/Umbraco.Abstractions/Collections/CompositeIntStringKey.cs
similarity index 100%
rename from src/Umbraco.Core/Collections/CompositeIntStringKey.cs
rename to src/Umbraco.Abstractions/Collections/CompositeIntStringKey.cs
diff --git a/src/Umbraco.Core/Collections/CompositeNStringNStringKey.cs b/src/Umbraco.Abstractions/Collections/CompositeNStringNStringKey.cs
similarity index 100%
rename from src/Umbraco.Core/Collections/CompositeNStringNStringKey.cs
rename to src/Umbraco.Abstractions/Collections/CompositeNStringNStringKey.cs
diff --git a/src/Umbraco.Core/Collections/CompositeStringStringKey.cs b/src/Umbraco.Abstractions/Collections/CompositeStringStringKey.cs
similarity index 100%
rename from src/Umbraco.Core/Collections/CompositeStringStringKey.cs
rename to src/Umbraco.Abstractions/Collections/CompositeStringStringKey.cs
diff --git a/src/Umbraco.Core/Collections/CompositeTypeTypeKey.cs b/src/Umbraco.Abstractions/Collections/CompositeTypeTypeKey.cs
similarity index 95%
rename from src/Umbraco.Core/Collections/CompositeTypeTypeKey.cs
rename to src/Umbraco.Abstractions/Collections/CompositeTypeTypeKey.cs
index cc555afe55..e08e3305d2 100644
--- a/src/Umbraco.Core/Collections/CompositeTypeTypeKey.cs
+++ b/src/Umbraco.Abstractions/Collections/CompositeTypeTypeKey.cs
@@ -5,7 +5,7 @@ namespace Umbraco.Core.Collections
     /// <summary>
     /// Represents a composite key of (Type, Type) for fast dictionaries.
     /// </summary>
-    internal struct CompositeTypeTypeKey : IEquatable<CompositeTypeTypeKey>
+    public struct CompositeTypeTypeKey : IEquatable<CompositeTypeTypeKey>
     {
         /// <summary>
         /// Initializes a new instance of the <see cref="CompositeTypeTypeKey"/> struct.
diff --git a/src/Umbraco.Core/Collections/ConcurrentHashSet.cs b/src/Umbraco.Abstractions/Collections/ConcurrentHashSet.cs
similarity index 100%
rename from src/Umbraco.Core/Collections/ConcurrentHashSet.cs
rename to src/Umbraco.Abstractions/Collections/ConcurrentHashSet.cs
diff --git a/src/Umbraco.Core/Collections/ObservableDictionary.cs b/src/Umbraco.Abstractions/Collections/ObservableDictionary.cs
similarity index 100%
rename from src/Umbraco.Core/Collections/ObservableDictionary.cs
rename to src/Umbraco.Abstractions/Collections/ObservableDictionary.cs
diff --git a/src/Umbraco.Core/Collections/OrderedHashSet.cs b/src/Umbraco.Abstractions/Collections/OrderedHashSet.cs
similarity index 95%
rename from src/Umbraco.Core/Collections/OrderedHashSet.cs
rename to src/Umbraco.Abstractions/Collections/OrderedHashSet.cs
index beae17adea..52b37bc7f9 100644
--- a/src/Umbraco.Core/Collections/OrderedHashSet.cs
+++ b/src/Umbraco.Abstractions/Collections/OrderedHashSet.cs
@@ -7,7 +7,7 @@ namespace Umbraco.Core.Collections
     /// and is customizable to keep the newest or oldest equatable item
     /// </summary>
     /// <typeparam name="T"></typeparam>
-    internal class OrderedHashSet<T> : KeyedCollection<T, T>
+    public class OrderedHashSet<T> : KeyedCollection<T, T>
     {
         private readonly bool _keepOldest;
 
diff --git a/src/Umbraco.Core/Collections/TopoGraph.cs b/src/Umbraco.Abstractions/Collections/TopoGraph.cs
similarity index 100%
rename from src/Umbraco.Core/Collections/TopoGraph.cs
rename to src/Umbraco.Abstractions/Collections/TopoGraph.cs
diff --git a/src/Umbraco.Core/Collections/TypeList.cs b/src/Umbraco.Abstractions/Collections/TypeList.cs
similarity index 95%
rename from src/Umbraco.Core/Collections/TypeList.cs
rename to src/Umbraco.Abstractions/Collections/TypeList.cs
index 37ca427ba1..43df5f1af4 100644
--- a/src/Umbraco.Core/Collections/TypeList.cs
+++ b/src/Umbraco.Abstractions/Collections/TypeList.cs
@@ -8,7 +8,7 @@ namespace Umbraco.Core.Collections
     /// </summary>
     /// <remarks>Types in the list are, or derive from, or implement, the base type.</remarks>
     /// <typeparam name="TBase">The base type.</typeparam>
-    internal class TypeList<TBase>
+    public class TypeList<TBase>
     {
         private readonly List<Type> _list = new List<Type>();
 
@@ -30,4 +30,4 @@ namespace Umbraco.Core.Collections
             return _list.Contains(type);
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/Umbraco.Core/Umbraco.Core.csproj b/src/Umbraco.Core/Umbraco.Core.csproj
index 99686e5bbb..42f7cdbc4a 100755
--- a/src/Umbraco.Core/Umbraco.Core.csproj
+++ b/src/Umbraco.Core/Umbraco.Core.csproj
@@ -117,6 +117,8 @@
     </Compile>
     -->
     <Compile Include="Cache\AppPolicedCacheDictionary.cs" />
+    <Compile Include="Collections\DeepCloneableList.cs" />
+    <Compile Include="Collections\ListCloneBehavior.cs" />
     <Compile Include="Compose\AuditEventsComponent.cs" />
     <Compile Include="Cache\AppCaches.cs" />
     <Compile Include="Cache\CacheKeys.cs" />
@@ -149,15 +151,6 @@
     <Compile Include="Cache\SingleItemsOnlyRepositoryCachePolicy.cs" />
     <Compile Include="Cache\DictionaryAppCache.cs" />
     <Compile Include="Cache\TypedCacheRefresherBase.cs" />
-    <Compile Include="Collections\CompositeNStringNStringKey.cs" />
-    <Compile Include="Collections\CompositeStringStringKey.cs" />
-    <Compile Include="Collections\CompositeIntStringKey.cs" />
-    <Compile Include="Collections\CompositeTypeTypeKey.cs" />
-    <Compile Include="Collections\ConcurrentHashSet.cs" />
-    <Compile Include="Collections\DeepCloneableList.cs" />
-    <Compile Include="Collections\ListCloneBehavior.cs" />
-    <Compile Include="Collections\ObservableDictionary.cs" />
-    <Compile Include="Collections\TypeList.cs" />
     <Compile Include="Compose\AuditEventsComposer.cs" />
     <Compile Include="Composing\ComponentComposer.cs" />
     <Compile Include="Composing\Composers.cs" />
@@ -863,7 +856,6 @@
     <Compile Include="NameValueCollectionExtensions.cs" />
     <Compile Include="NetworkHelper.cs" />
     <Compile Include="ObjectExtensions.cs" />
-    <Compile Include="Collections\OrderedHashSet.cs" />
     <Compile Include="Packaging\ConflictingPackageData.cs" />
     <Compile Include="Models\Packaging\UninstallationSummary.cs" />
     <Compile Include="Packaging\PackageExtraction.cs" />
@@ -1443,7 +1435,6 @@
     <Compile Include="Sync\RefreshMethodType.cs" />
     <Compile Include="Sync\ServerMessengerBase.cs" />
     <Compile Include="Sync\SingleServerRegistrar.cs" />
-    <Compile Include="Collections\TopoGraph.cs" />
     <Compile Include="TypeExtensions.cs" />
     <Compile Include="Udi.cs" />
     <Compile Include="UdiDefinitionAttribute.cs" />