- Abbott, Robert Tucker
- Abele, L.
- Abello, P.
- Abelló, P.
- Ackiss, Amanda
- Adelaide, Of
- Adema, J.P.H.M.
- Administration, Atmospheric
- Administration, Drug
- Adriana, Bermudez Tobón
- Aerfeldt, P.
- Afzelius, Adam
- Agassiz, Louis
- Agassiz
- Agassiz, Alexander
- Agnew, Jeff
- Agrenius, Stefan
- Aguilar, C.
- Aguilera
- Aguilera, De
- Aguilera, Jorge Luis Hernández
- Ahyong, Shane
- Ahyong, S.
- Alauddin, Miraj
- Albatross, R.V.
- Albatross, Usfcs
- Albert
- Albury, Ruby
- Alcock
- Alejandro, Varila Diego
- Allen, E.
- Almazán, Silvia Toral
- Almunia
- Alonso, Gómez Lemos Luis
- Alvsvåg, John
- Amesbury, S.
- Anders, Alice
- Anderson
- Anderson, W.
- Andrefouet, Serge
- Andrews, A.
- André, Capart
- Andrés, Cortés Pineda Fabian
- Angeli, De
- Anker, Arthur
- Anker, A.
- Antiga, Pedro
- Antoon, Ovaere
- Aníbal, Ruiz López José
- Apel, M.
- Apel
- Aplica, N.O.
- Ardmore, O.K.
- Arenas, V.
- Ariyama, Hiroyuki
- Armonies, Werner
- Armstrong, H.W.
- Arnold, Jim
- Atkinson, R.J.A.
- Atlantis, V.
- Atlantis, R.V.
- Avery, Lynda
- Aves, Elizabeth
- Aziz, J.
- Bacchet, Phillippe
- Bacchet, Philippe
- Baeza, Antonio
- Baker, M.
- Baker, Ken
- Bale, L.
- Ball
- Ballance, Alison
- Bandeira, W.D.
- Banfield, E.J.
- Banks, Joseph