Figure 1 from the 1911 Encyclopædia Britannica article "rhinoceros" showing an Indian rhinoceros (Rhinoceros unicornis), Vol. 23, p. 244.
Date 1911
Source 1911 Encyclopædia Britannica
Author J. Wolf
Source: https://commons.wikimedia.org/wiki/File:Britannica_Indian_Rhinoceros.jpg

The Indian rhinoceros (Rhinoceros unicornis), also called the greater one-horned rhinoceros and great Indian rhinoceros, is a rhinoceros native to the Indian subcontinent. The Indian rhinoceros once ranged throughout the entire stretch of the Indo-Gangetic Plain, but excessive hunting and agricultural development reduced their range drastically to 11 sites in northern India and southern Nepal.