jlanng System.Collections.Immutable.Net40 by: jlanng .NET Framework This package is compatible with all versions of .NET Framework. 425,313 total downloads last updated 6/5/2014 Latest version: 1.0.30.17 immutable collections Retargeted for .Net 4.0. Unofficial, unsupported build https://github.com/jlanng/ImmutableCollectionsNet40