For assistance in identifying various types of architectural and engineering drawings, you may wish to check: "Photo-Reproductive Processes Used for the Duplication of Architectural and Engineering Drawings: Creating Guidelines for Identification" by Judith Reed, Eleonore Kissel, and Erin Vigneau, in "The Book and Paper Group Annual", v. 14 (1995), pages 41-49. Misses Reed and Vigneau are identified as being with the New York Botanical Garden Library, which - the article says - has a large collection of such drawings. Also, I wonder what help might be obtained from: American Institute of Architects 1735 New York Avenue, NW Washington, D.C. [I don't have ZIP] Also, I'm checking for a National Park Service office which may have preservation information; I'm thinking about e.g. the Frederick Law Olmstead National Historic Site which has lots of blueprints. I'll report if I find more information. Good Luck. Carol Edwards Carol A. Edwards, Head U.S. Geological Survey Field Records Library MS 914, Box 25046, Federal Center Denver, CO 80225-0046 phone: 303/236-1005 fax: 303/236-0015 email: [log in to unmask] "Round up the usual disclaimers..."