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- Author(s):
- Davis, William Morris, 1850-1934 author
- Publication:
- [Philadelphia?] : [publisher not identified], [1887?]
- Subject(s):
- Geology -- education
Teaching
- Author(s):
- Williams, Henry Shaler, 1847-1918 author
- Publication:
- [Philadelphia?] : [publisher not identified], [1887?]
- Subject(s):
- Geology -- education
Teaching