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Subjects
- Agassiz, Alexander--Correspondence16
- Agassiz, Louis--Correspondence15
- Alexander, W. D. (William De Witt)--Correspondence15
- Allen, George N--Correspondence15
- Allen, Harrison--Correspondence15
- Allen, J. A. (Joel Asaph)--Correspondence15
- Allman, George James--Correspondence15
- Andrew, John A. (John Albion)--Correspondence15
- Anthony, John Gould--Correspondence15
- Arago, Emmanuel--Correspondence15
- Arango y Molina, Rafael--Correspondence15
- Atwood, N. E--Correspondence15
- Ayme, Louis Henri--Correspondence15
- Bache, A. D. (Alexander Dallas)--Correspondence15
- Bain, Francis--Correspondence15
- Baird, Spencer Fullerton--Correspondence15
- Barbosa du Bocage, J. V. (José Vicente)--Correspondence15
- Barkas, Thomas P. (Thomas Pallister)--Correspondence15
- Barrande, Joachim--Correspondence15
- Barris, W. H--Correspondence15