Popular in the 1940s and 1950s, Western comics featured stories of the American frontier. Some comics in Special Collections that fall under this genre include:
Jonah Hex: 1970s and 80s
Also a 2010 movie, Western anti-hero Jonah Hex had his own title from 1978-1985. A bounty hunter whose face was scarred after a fight with Indians, the series has pretty typical Western themes, but sometimes ventured into the supernatural.
Weird Western Tales: #13-23
Published by DC Comics, the comic is known for featuring Jonah Hex.
Crisis on Infinite Earths