One of my current projects is venturing into Colonial Africa, and the Perry range for Sudan caught my fancy. Their book, "Go Strong into the Desert" is no doubt very useful for painters and scenario-builders, but does it contain much useful information and illustrations about the man-made structures of the area and time? My guess is that there is plenty inspiration for landscapes, but what about rural houses, Sudan cities and the like?
Likewise, are there any other, preferably online, resources you would recommend?