1. Ontogeny, intraspecific variation, and systematics of the Late Cambrian trilobite Dikelocephalus Author/Creator: Hughes, Nigel C. Publication/Creation: Washington, D.C. : Smithsonian Institution Press, 1994 Resource Type: Book Access & Availability: Loading
2. Outline of the cambrian system in the Yangtze basin Author/Creator: Kobayashi, Teiichi, 1901-1996 Publication/Creation: [Tokyo] : [publisher not identified], [1943?]] Resource Type: Book Access & Availability: Loading