Mapping is another critical part of the Massachusetts Geological Survey. Before he ended his 22-year term as state geologist, Mabee published a updated bedrock map of the state.

Geological Map of Monte Somma and Vesuvius. Constructed by H. J. Johnston-Lavis., &c., during the Years 1880–88. Scale, 1:10,000 (6˙33 inches = 1 mile).

A map of Chicago, Illinois, imprinted in 1913 from the United States Geographical Survey’s historical topographic map collection. Image courtesy of the USGS Map lovers, rejoice! The United ...