The Library of the BNHS is one of the oldest and largest libraries on natural history in India. This is a special library having information sources on Natural History, Wildlife, Ecology, Zoology, Botany and Environment Conservation. Its collection of antique books and rare lithographs of the 19th and 20th Century, which are not available elsewhere, is priceless. It also has a valuable collection of photo-negatives, transparencies, particularly those of the late E. P. Gee, Loke Wan Tho, R.S.P. Bates, M. Krishna, Dr. Sálim Ali and those generated by the various scientific projects of the BNHS.