Thanks to everyone for their responses to my query.  I should have mentioned that I have a copy of Moffat's book; I'm actually looking for an index of of repositories that actually have these maps.  You've given me some good leads and I really appreciate it.  Thanks,

Morgan Rieder, RPA

----- Original Message ----- 
  From: Webb, Paul<mailto:[log in to unmask]> 
  To: [log in to unmask]<mailto:[log in to unmask]> 
  Sent: Thursday, December 07, 2006 6:24 AM
  Subject: Index to Older Topo Maps


  Check out:

  Map Index to Topographic Quadrangles of the United States, 1882-1940, by
  Riley Moore Moffat. 1985. Western Association of Map Libraries
  Occasional Publication 10. 

  "A graphic bibliography of out-of-print topographic maps published from
  1882 to 1940, in the 15-, 30-, and 60-minute series for all states
  except Alaska"

  I ordered my copy about 5 years ago; not sure if it is still in print or
  not.