1. Late Paleozoic gastropoda from northern Alaska, Author/Creator: Yochelson, Ellis L. 1928-2006. (Ellis Leon) Publication/Creation: Washington : U.S. Govt. Print. Off, 1960 Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no. 334-337. Access & Availability: Loading
2. The Lower Ordovician gastropod Ceratopea, Author/Creator: Yochelson, Ellis L. 1928-2006. (Ellis Leon) Publication/Creation: Washington : U.S. Govt. Print. Off, 1957 Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no. 294 A-M. Access & Availability: Loading