Counter Strike: Source needed for textures & models/props.
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Place garrysmod folder in your steamapp's GarrysMod folder.
C:\Program Files (x86)\Steam\steamapps\common\GarrysMod

Or place the map file directly in the map folder.
C:\Program Files (x86)\Steam\steamapps\common\GarrysMod\garrysmod\maps
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Comments or suggestions? Contact me:
GameBanana: TC224
YouTube: CasualKhakis