Late Eocene sea cows (Mammalia, Sirenia) from Wadi al Hitan in the Western Desert of Fayum, Egypt / Iyad S. Zalmout, Philip D. Gingerich. 37 - Late Eocene sea cows (Mammalia, Sirenia) from Wadi al Hitan in the Western Desert of Fayum, Egypt, 2012   .  Ann Arbor, Mich. :  University of Michigan,  2012 . xiii, 158 s.