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| Field name | Value |
|---|---|
| Title | Heading of Mariposa Tunnel |
| Reference | MS 717, folder 5 |
| Library | California Historical Society |
| Date | n.d. |
| Author(s) | Burr, Ephraim Willard |
| Description | Drawing of elements of a mine. |
| Document Type | Private Papers |
| Primary Commodity | Silver and Gold |
| Theme | Cultivation |
| Keywords | mining, equipment |
| Region | North America |
| Places | USA, California |
| Copyright | California Historical Society |