David White Books
Antiquarian and interesting out-of-print medical books; specializing in the history of medicine and pharmacy.

Scholarly Books
Specializing in psychology, psychiatry, psychoanalysis, neuroscience and all aspects of the study of the mind and brain. Catalogues issued periodically and upon request in all fields of specialty.

GeoLibri
Second-hand books in geology and palaeontology.

Wheldon and Wesley Ltd
Natural history books.

Natural History Books
Rare and hard to find books, especially ornithology and herpetology.

Old South Books
Specializes in old and rare medical books; based in Memphis, Tennessee, books bought and sold.

Stephan P. Wolf Books
Books and other media on carnivorous plants, free booksearches, and a list of books on the subject. Also available in German.

W. Bruce Fye
Old, rare, and out-of-print books in medicine, surgery, and related fields.

Ornithology Books and Journals
Out-of-print ornithology books and journals. Some back issues of hard-to-find journals.

Buteo Books
Offers used, new, and rare books about birds and ornithology.

Jan Meemelink
Old, rare and second hand books and prints on botany, gardens, horticulture, and agriculture. based at The Hague, Netherlands.

Gary Wayner
Used, rare and scholarly natural history books with an emphasis on botany.

Jonathan Grobe Books
Used and out-of-print scientific, technical and scholarly books.