- Buteo Books - - Offers used, new, and rare books about birds and ornithology.
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- David White Books - - Antiquarian and interesting out-of-print medical books; specializing in the history of medicine and pharmacy.
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- Gary Wayner - - Used, rare and scholarly natural history books with an emphasis on botany.
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- GeoLibri - - Second-hand books in geology and palaeontology.
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- Jan Meemelink - - Old, rare and second hand books and prints on botany, gardens, horticulture, and agriculture. based at The Hague, Netherlands.
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- Old South Books - - Specializes in old and rare medical books; based in Memphis, Tennessee, books bought and sold.
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- 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.
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- 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.
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- W. Bruce Fye - - Old, rare, and out-of-print books in medicine, surgery, and related fields.
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