There are multiple copies of the same map in your Historical Topographic Map Collection that all have the same date. Is there a difference between those maps?

Yes, these are different maps that typically resulted from revisions and reprints. The differences are often minor.

The date used to identify a map can be found in the lower right corner. If there are multiple editions with the same compilation date, look for additional dates in the lower right portion of the map collar that might differentiate them:

  • Date on Map -- The year of base compilation, or the year of a significant revision
  • Imprint Year -- The year the map was printed
  • Photo Inspection Year -- The year when a photo inspection was last done on the map
  • Photo Revision Year -- The year when photos were used to revise a map
  • Field Check Year -- The year map content was verified in the field
  • Survey Year -- The year when a field survey was completed for the mapped area
  • Edit Year -- The year the map was last globally edited or revised

Learn more: Historical Topographic Maps - Preserving the Past

Related Content

Filter Total Items: 14
Scan of the 1893 USGS quadrangle of the Mount Washington, New Hampshire area

Scan of the 1893 USGS quadrangle of the Mount Washington, New Hampshire area

Scan of the 1893 USGS quadrangle of the Mount Washington, New Hampshire area from the USGS

...
1940 legacy topographic map quadrangle of the Spring Creek area

1940 legacy topographic map quadrangle of the Spring Creek area

Scan of the 1940 legacy topographic map quadrangle of the Spring Creek area (Arran quad, 1:62,500 scale) from the USGS 

...