The Division began processing numerous geological quadrangle maps and reports for publication.

Burbank, California, 7.5 minute topographic quadrangle map.

Pasadena, California, 7.5 minute topographic quadrangle map.

Then there was the problem a Geological Survey fieldman had in proposing the name of a quadrangle map in New Mexico.

Since quadrangle maps are named for the most prominent feature on the map, he had difficulty trying to explain his choice of name.

Dissertation, Johns Hopkins University (unpublished) and 7 ' quadrangle maps.

During the registration process, prospective volunteers submitted a list of the 7.5 minute quadrangle maps they wish to work on.

In the United States, a 7.5 minute quadrangle map covers an area of 49 to 70 square miles.

In the 1990s and early 2000s there was a consensus in the U.S. mapping community that the era of traditional quadrangle maps had ended.

If you want the most up-to-date edition of our famous topographic quadrangle map that contains the latest digital improvements to include an image layer, try the US Topo.