This collection contains Sanborn fire insurance maps of cities across Colorado. The CU Boulder Map Library has the most complete collection of Sanborn maps of Colorado outside of the Library of Congress.
The print collection contains maps for approximately 560 cities, beginning in 1883 and ending in 1937.
A subset of this collection has been digitized. The digital collection contains maps of 79 principal cities in 52 counties covering the years 1883-1922.
The Historical Aerial Photographs of Colorado collection is comprised of more than 20,000 print aerials, which are housed in the Map Library.
For your Boulder parks project, you can access Boulder aerials from 1937 here.
For your Boulder parks project, you can request other decades of aerial coverage of Boulder by emailing firstname.lastname@example.org.