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German Museum of Technology File English
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* Material and correspondence on shortwave, radiotelephony and German colonia...

* Material and correspondence on shortwave, radiotelephony and German colonial radio * 1

Supplement IV to the list of glass photograms containing "Greenland Glac...

Supplement IV to the list of glass photograms containing "Greenland Glaciers", photographs by Prof.Dr. Erich von Drygalski, "Electrical Engineering and Gas Technology", Descriptive Natural Sciences, "Country and Ethnology", e.g. East Africa, Southwest Africa, China, Japan, etc. etc. etc.