-------- Original Message -------- Subject: old USGS indexes Date: Tue, 14 Jun 2011 20:19:33 +0000 From: Riley Moffat <[log in to unmask]> To: [log in to unmask] <[log in to unmask]> Aloha all: Rarely, but it does happen, a 7.5’ sheet will change its name which an old index will show. Also, the most important reason is that as the USGS lets topographic maps go out-of-print, they are dropped from the indexes. This has happened to just about all 15’, 30’, 60’ and special sheets. That’s why I created the “Map Index to Topographic Quadrangles of the United States, 1882-1940” in 1985. Since then the newer 15’ sheets produced in the 1940s, 1950s, and 1960s have disappeared off the indexes. All the special sheets such as mining districts and river surveys have also disappeared, but are locatable in Peter Stark’s “A Cartobibliography of Separately Published U.S. Geological Survey Special Maps and River Surveys” both available from Western Association of Map Libraries. If your library serves genealogists or historians, these are good reasons to keep these indexes. Riley Moffat, Senior Librarian Brigham Young University – Hawaii