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Heinrichs Geoexploration Co. Maps: World's Fair Mine, Adjusted Claim Map; 1 in. to 200 feet; 43 x 36 in.
Heinrichs Geoexploration Co. Maps: World's Fair Mine Claim Map; 1 in. to 400 feet; 21 x 17 in.
Heinrichs Geoexploration Co. Maps: World's Fair Underground Workings; 1 in. to 40 feet; 36 x 20 in.
Heinrichs Geoexploration Co. Maps: World's Fair Silver Geochemical Survey; 1 in. to 200 feet; 26 x 24 in.
Heinrichs Geoexploration Co. Maps: World's Fair Copper Geochemical Survey; 1 in. to 200 feet; 28 x 18 in.
The 'World's Fair Mine' file is part of the Grover Heinrichs mining collection. Grover was the Vice President of Heinrichs GEOEXploration, located in Tucson, Arizona. The collection contains over 1,400 folders including economic geology reports, maps, photos, correspondence, drill logs and other related materials. The focus of much of the information is on the western United States, particularly Arizona, but the collection also includes files on mining activity throughout the United States, foreign countries, and 82 mineral commodities.
Heinrichs Geoexploration Co. Maps: World's Fair Mine, Property Map; 1 in. to 300 feet; 21 x 14 in.
Heinrichs Geoexploration Co. Maps: World's Fair Syndicate Upper Most Tunnel Area; 1 in. to 20 feet; 25 x 36 in.
Heinrichs Geoexploration Co. Maps: World's Fair Mine Claim Map; 1 in. to 500 feet; 24 x 27 in.
Heinrichs Geoexploration Co. Maps: World's Fair Mine Original Survey; 1 in. to 200 feet; 42 x 43 in.
Heinrichs Geoexploration Co. Maps: World's Fair Underground Workings; 36 x 21 in.
Heinrichs Geoexploration Co. Maps: World's Fair Project Composite of Topography and Claim Map; 1 in. to 200 feet; 38 x 31 in.
Heinrichs Geoexploration Co. Maps: World's Fair Lead Geochemical Survey; 1 in. to 200 feet; 28 x 18 in.
Heinrichs Geoexploration Co. Maps: World's Fair Lead Geochemical Survey; 1 in. to 200 feet; 28 x 18 in.
Heinrichs Geoexploration Co. Maps: Claim Map of World's Fair Project; 1 in. to 200 feet; 36 x 30 in.
Heinrichs Geoexploration Co. Maps: World's Fair Syndicate, Cross Sections A and B; 1 in. to 50 feet; 22 x 17 in.
Heinrichs Geoexploration Co. Maps: World's Fair Silver Geochemical Survey; 1 in. to 200 feet; 30 x 18 in.
Heinrichs Geoexploration Co. Maps: World's Fair Copper Geochemical Survey; 1 in. to 200 feet; 28 x 18 in.
Heinrichs Geoexploration Co. Maps: World's Fair Mine Claim Map; 1 in. to 500 feet; 22 x 27 in.
Heinrichs Geoexploration Co. Maps: World's Fair Mine, Property Map; 1 in. to 300 feet; 28 x 23 in.
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