Nelson RA, Griswold TL. The floral hosts and distribution of a supposed creosote bush specialist, Colletes stepheni Timberlake (Hymenoptera: Colletidae). J. Melittol. [Internet]. 2015 May 12 [cited 2024 May 6];(49):1-12. Available from: https://journals.ku.edu/melittology/article/view/4836