The Prospector's Fieldbook and Guide in the search for ... Minerals. Illustrated, etc
A practical handbook for prospectors by Henry Stafford Osborn, published in Philadelphia by H. C. Baird & Co. in 1892, teaching miners and surveyors how to read ground for ore. The plates are line diagrams: cross-sections of hillsides with hatched and ruled rock beds, dotted survey triangles lettered A to K, and numbered figure captions, useful as geometric ground for technical or geological layouts.
