The BNHS library is one of the oldest and largest libraries in India dedicated to natural history. It is a source of information on various subjects such as wildlife, ecology, zoology, botany and environment conservation. It has a priceless collection of antique books and rare lithographs from the nineteenth and twentieth centuries, many not available elsewhere. The library houses valuable photo-negatives and transparencies, particularly those of E.P. Gee, Loke Wan Tho, R.S.P. Bates, M. Krishna and Dr. Sálim Ali, and those generated through various scientific projects of the BNHS.