- Ab
- Abbott, W.
- Abbott, Robert Tucker
- Abele, L.
- Abello, P.
- Abelló, P.
- Abelló
- Aca
- Ackiss, Amanda
- Ad
- Adair, D.S.
- Adema, J.P.H.M.
- Administration, Atmospheric
- Administration, Drug
- Adriana, Bermudez Tobón
- Aerfeldt, P.
- Afzelius, Adam
- Agassiz, Alexander
- Agassiz, Louis
- Agnew, Jeff
- Agrenius, Stefan
- Aguilar, C.
- Aguilera
- Aguilera, Jorge Luis Hernández
- Ahmed, Sagir
- Ahyong, Shane
- Ahyong, S.
- Ahyong, T. Shane
- Ajin
- Akvaplan-niva, A.S.
- Albatross, Stmr
- Albatross, R.V.
- Albatross, Usfcs
- Albatross, U. S. F. C. Str
- Albatross, U.S.S.
- Albert
- Albury, Ruby
- Alcock
- Aldrich, Miss
- Alejandro, Varila Diego
- Alexander, W.B.
- Allen, E.
- Allison, Edwin C.
- Allpike, B.
- Almazán, Silvia Toral
- Almunia
- Alonso, Gómez Lemos Luis
- Amaral, Antonia Cecilia Zacagnini
- Amesbury, S.
- Anders, Alice
- Anderson
- Anderson, W.
- Andreakis, N.
- Andrefouet, Serge
- Andrews, P.
- Andrews, A.
- André, Capart
- Andrés, Cortés Pineda Fabian
- Angermeyer, F.
- Angermeyer, C.
- Angermeyer, Carmen
- Anker, Arthur
- Anker, A.
- Antiga, Pedro
- Antoon, Ovaere
- Aníbal, Ruiz López José
- Apel, M.
- Apel
- Aplica, N.O.
- Arbasto, J.
- Ardmore, O.K.
- Arenas, V.
- Ariyama, Hiroyuki
- Armstrong, John C.
- Armstrong, H.W.