A lot of people have been interested and excited about the new USGS Historical Topographic Map Explorer


So this may also be of interest:

ESRI Story Maps have become popular information sources when helping library users: http://storymaps.arcgis.com/en/

Selected example collections: 

Events and Disasters: http://tinyurl.com/pcs5r5c

Infrastructure and Planning: http://tinyurl.com/mjcdbs9

Nature and Environment: http://tinyurl.com/kgw2fvu

Science and Technology: http://tinyurl.com/kh298dd

A list of all Story Collections: http://storymaps.arcgis.com/en/collections/

..And if one would love to learn more about maps:

ESRI Free Online Course:
Go Places with Spatial Analysis

Enjoy the day,

Emily Wild
Librarian (Physical Scientist)
U.S. Geological Survey
Denver Library
Box 25046, MS 914
Denver Federal Center
Denver, CO 80225-0046
ph: (303) 236-1003
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USGS Libraries: http://library.usgs.gov
Tutorials: http://tinyurl.com/lh3tmua
Professional Page: http://profile.usgs.gov/ecwild