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1. Engineering Geology of Washington, D.C.: Washington, D.C. to Greenbelt, Maryland, July 14, 1989, Field Trip Guidebook T234
O'Connor
American Geophysical Union
E-ISBN: 9780875906669 ISBN: 9781118667538
2. Exploration of Rock Creek Park-North: Washington, D.C., July 17, 1989, Field Trip Guidebook T209
O'Connor
American Geophysical Union
E-ISBN: 9780875906980 ISBN: 9781118667514
3. Geological Exploration of the Southern Rock Creek Valley in DC: Washington, D.C., July 13, 1989, Field Trip Guidebook T208
O'Connor
American Geophysical Union
E-ISBN: 9780875906744 ISBN: 9781118667521