Underground workings at shaft no. 1, Black Cloud No. 1 : [near Johannesburg, Calif.] / surveyed July 1935 by Eugene L. Grunsky, civil engineer. 1935.
Related Entities
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Grunsky family.
http://n2t.net/ark:/99166/w6km86nb (family)
Grunsky, Eugene L.
http://n2t.net/ark:/99166/w67d3650 (person)