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- Amebae 1
- Amiba 1
- Amibas del aire 1
- Amibiasis 1
- Amigdalas 1
- Anachlorhydria 1
- Anaclorhidria 1
- Anal Segment 1
- Anatomía Patológica 1
- Ancylostomatoidea 2
- Anemia 6
- Anemia Macrocítica 1
- Anemia Pernicious 2
- Animal Diseases 1
- Annual Malaria Mortality from1910-1924 1
- Annual report 1
- Anopheles 1
- Anopheles Albimanus 1
- Anopheles mosquitoes breeding areas Puerto Rico 1
- Anthelmintic 2