The natural history of horses : the equidae or genus equus of authors / by Chas. Hamilton Smith.
Date 1841
Source http://www.biodiversitylibrary.org/pageimage/18556876
Author Conrad Gessner; Charles Hamilton Smith
Source: https://commons.wikimedia.org/wiki/File:The_natural_history_of_horses_(Plate_XX)_BHL18556876.jpg

The Mongolian wild ass (Equus hemionus hemionus), also known as Mongolian khulan is the nominate subspecies of the onager. It is found in Mongolia and northern China, and was previously found in eastern Kazakhstan and southern Siberia before being extirpated there through hunting.