Subject
- Atomic bomb3
- Atomium (Brussels, Belgium)3
- Belgium--Brussels3
- Botanists3
- Canada3
- Carver, George Washington, 1864?-19433
- Curie, Pierre, 1859-19063
- Elizabeth II, Queen of Great Britain, 1926-3
- Ghana3
- Metric system3
- Monuments3
- Nuclear facilities3
- Offset lithography3
- Petroleum refineries3
- Togo3
- Unesco3
- Arab Petroleum Congress2
- Arrhenius, Svante, 1859-19272
- Auer v. Welsbach, Carl (Auer von Welsbach), 1858-19292
- Behring, Emil von, 1854-19172