useful stuff gfx community textures source

Allegorithmic

Turbo Squid

Noctua Graphics

GFX - artist

deviantART

ElfWood

3D caffè

Raph - 3D.Artists

Mayang Textures

Texture World

True 3D Textures

Amazing Textures
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3D-CG-Mehanical-Conceptual

Achtung Panzer

Exozet games

Documentary photography

Bojan's blog