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Subject
- Berl, Ernst, 1877-194624
- United States. Department of State6
- Waste products as fuel5
- Berl, Herbert4
- Biomass energy4
- Patents4
- National Inventors Council (U.S.)3
- Real property--Foreign ownership--Government policy3
- Report cards3
- Schools, German3
- United States. War Department3
- World War (1939-1945)3
- Germany. Reichspatentamt2
- Gruhn, E. W.2
- Hackworth, Green Haywood, 1883-19732
- Naturalization2
- United States. Patent Office2
- American periodicals--Foreign language press1
- Ammunition1
- Avinoff, Andrey, 1884-19491