Browse Items (1 total) Browse All Browse by Tag Search Items Tags: Geological Surveys Sort by: Title Creator Date Added Kirchin081 A slide image of a map that shows the distribution of granite and allied rocks in the United States. The map was compiled from other maps by G.F. Loughlin in 1918. For some background information on the geologist, Gerald Francis Loughlin, click… Tags: 1918, Allied Rocks, Distribution, Geological Surveys, GF Loughlin, Granite, Map, Maps, State, United States Output Formats atom, dcmes-xml, json, omeka-xml, rss2