A c. 1910–1920 geological earth crust stone Collection by Dr. F. Krantz
Bonn (Germany), comprising 40 sedimentary rock and 10 eruptive rock formations, in wood and (later) plexiglas framed display case with a metal Krantz label “Dr. F. KRANTZ / IN BONN AM RHEIN”. Size c. 96 x 64 cm. (WU).
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