The fully revised second edition of this acclaimed encyclopaedia has 5 volumes devoted to mammals, allowing a thoroughness of coverage, combined with standards of photography, which single-volume works cannot match.
Volume 12: Echidnas to Tasmanian Wolves
Volume 13: Bandicoots to Vespertilionid
Volume 14: Primates to True seals
Volume 15: Whales, dolphins, and porpoises to Pronghorn
Volume 16: Kudus, buffaloes, and bison to Elephant Shrews