We have a question from a patron concerning a list of USGS / Corps of Engineers 15 minute series (1:62,500) raised relief topos produced in the 20th early to mid 20th century. Does anyone know of such a resource? Ed Redmond Reference Specialist, and Curator, Vault Collections Library of Congress Geography and Map Division Washington, DC 20540 [log in to unmask]<mailto:[log in to unmask]>