The hlsdk.zip file you have requested: Tools and Utilities / SDK / Half-Life Mini SDK - 11.93mb is not available. Perhaps try browsing all files for the game Half-Life and upload any files you want to share or are missing. This is the only information we could locate:

An old SDK (from November 1998), also known as Model and Map SDK. An old SDK (from November 1998), also known as Model and Map SDK. It contains everything that Standard SDK 2.2 contains and several pre-release Gluon Gun viewmodel textures.

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