The sand elevator in 1938. Courtesy MNHS.org
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The car elevator in 1938. Courtesy MNHS.org
Drivers for the Hercules Powder Company. Kansas Historical Society ( FK2.D4 .3 Ma.Sun *2) http://www.kansasmemory.org/item/210946
A 1917 ad for Miscampbell Trucks (Duluth News Tribune).
After 2 out of 3 major expansions, 1920s, Janesville Gazette, http://zoominlocal.com/
Golden Fleece Mine, between 1870 and 1890. Courtesy of Denver Public Library.
Tour Brochure: Glass Ops
The Frontenac workings, as mapped in 1912 for a company report, sent to London. Special thanks to Mark Baldwin, who posted these on his website.
Source: JT Reeder / Michigan Tech Archives
Engine #2 exiting the quenching tower, 1954. Source: donrossgroup.net