Historical zoogeography and current status of two species of hybridizing ground squirrels (Ictidomys parvidens and I. tridecemlineatus) on the southern plains of Texas - Stangl, Frederick B., Jr. (Lubbock, TX, Museum of Texas Tech University, 2012, 2012)
https://www.biodiversitylibrary.org/bibliography/157752
Keywords: Squirrels|Texas|