English: Austrian workers at iron mines in Minnesota.
Date
Source
"The Typhoid Fly on the Minnesota Iron Range." Address delivered under auspices of the Entomological Society of America, at their winter meeting in Minneapolis, December 28, 1910. Popular Science Monthly, Vol. 79 (1911), pp. 137-150. Photo: p. 148.
Author
Washburn, F.L., Agricultural Experiment Station, Anthony Park, MN.
Licensing
Public domainPublic domainfalsefalse
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