The "Facts on File: Encyclopedia of Mammals" is a comprehensive 3-volume set that offers detailed information on various mammal species. Published in 2001 by Facts On File, Incorporated, this textbook is part of the Facts on File Natural Science Library series. Written by Sasha Norris, this encyclopedia covers a wide range of subjects related to nature and science, specifically focusing on mammals. With a total of 960 pages, this hardcover set is a valuable resource for those interested in animals, specifically mammals, and the life sciences.