Don't type another message, just edit the first one.
That said, Map-related stuff is not really documented.
I know some of the textures are located in G_scWall, which has multiple versions depending on the season. (G_scWallS for Summer, G_scWallW for Winter and G_scWall for the rest)
An easy way to check the textures is to get IMG Factory, which has a built-in texture viewer.