Geological Society of America
![Geological field excursion to Harpers Ferry, West Virginia, April 30, 1897, following the George Huntington Williams Memorial Lectures delivered by Sir Archibald Geikie at Johns Hopkins University. The photograph was taken by Joseph S. Diller at [[Jefferson Rock](https://upload.wikimedia.org/wikipedia/commons/2/2b/American_Geologists_WVa_1897.jpg)
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Published: 2002-
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Published: c1992-
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Published: 1951
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