----------------------------Original message---------------------------- Ken, I reply to your question to the listserv about historic topo maps: The book _Map Index to Topographic Quadrangles of the United States, 1882-1940_ by Riley Moore Moffat, c. 1985, indexes the 1:125,000 and 1:250,000 maps by state. On page viii of the forward it is explained that the 1:250,000 was used for undeveloped areas of the west. There are many 1:125,000 sheets in the west also. Unfortunately, this great book excluded the early 6-minute (Los Angeles County), pre-1940 7.5-minute quads and the 1:31,380 series of the 1940's. I'm currently making an inventory of my library's historic topographic maps. If you would like to compare notes please feel free to reply to: [log in to unmask] I'm very interested in finding any index maps for the 6-minute series or the 1:31,380 scale series. John Anderson Cartographic Information Center Louisiana State University