Profiles and half-sections at the mid-point of the three forms of jongkong found in the Riau-Lingga area.<br> This vector drawing is a reproduction of a sketch by C. A. Gibson-Hill.
<a href="//commons.wikimedia.org/wiki/User:Verosaurus" title="User:Verosaurus">Verosaurus</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>