| D010678 |
Philately |
Study of stamps or postal markings. It usually refers to the design and commemorative aspects of the stamp. |
Postage Stamps,Philatelies,Postage Stamp,Stamp, Postage,Stamps, Postage |
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| D000047 |
Academies and Institutes |
Organizations representing specialized fields which are accepted as authoritative; may be non-governmental, university or an independent research organization, e.g., National Academy of Sciences, Brookings Institution, etc. |
Institutes,Research Institutes,Academies,Academy and Institute,Institutes and Academies,Academy,Institute and Academy,Institute, Research,Institutes, Research,Research Institute |
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| D049673 |
History, 20th Century |
Time period from 1901 through 2000 of the common era. |
20th Century History,20th Cent. History (Medicine),20th Cent. History of Medicine,20th Cent. Medicine,Historical Events, 20th Century,History of Medicine, 20th Cent.,History, Twentieth Century,Medical History, 20th Cent.,Medicine, 20th Cent.,20th Cent. Histories (Medicine),20th Century Histories,Cent. Histories, 20th (Medicine),Cent. History, 20th (Medicine),Century Histories, 20th,Century Histories, Twentieth,Century History, 20th,Century History, Twentieth,Histories, 20th Cent. (Medicine),Histories, 20th Century,Histories, Twentieth Century,History, 20th Cent. (Medicine),Twentieth Century Histories,Twentieth Century History |
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