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| Title | The subterranean world |
| Author | Hartwig,G |
| Date | 1885 |
| Pages | 522 |
| Subject | Caves |
| Number | 1741 Locked cupboard |
| Type | Book |
| Web | https://babel.hathitrust.org/cgi/pt?id=coo1.ark:/13960/t01z4rb1b |