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John T. Bradley     

John T. Bradley, "The 49er Collection," apparently operated World's Minerals at 2417 San Pablo Avenue in Oakland, California. He also sold maps and fluorescent lamps. Ads for World's Minerals first appeared in the May 1943 issue of Rocks & Minerals, offering gold specimens from the California Mother Lode region. Subsequent ads in 1944-1945 offered tourmaline specimens from the Mesa Grande district, California, and fluorescent lights and minerals. In 1946 he began offering educational rock and mineral sets, each designed for specific purposes such as (hardness demonstration, prospecting, streak testing, tenacity, luster, etc.). In 1947-1949 he branched out into lapidary machines and county maps. His last ad appeared in September 1949.
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[Citation format for this entry:
WILSON, Wendell E. (2019)
Mineralogical Record
Biographical Archive, at]
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The Mineralogical Record - John T. Bradley 32 x 47 mm
The Mineralogical Record - John T. Bradley 39 x 51 mm
Also showing the "World's Minerals" stamp on the back. The same stamp is on the back of the example shown above.
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