Second contribution to the studies on the Cambrian faunas of North America Walcott, Charles D. (Charles Doolittle), 1850-1927 creator Geological Survey (U.S.) contributor text book Washington G.P.O 1886 1886
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ENG At head of title: United States Geological Survey. Cover title: Bulletin of the United States Geological Survey ; no. 30. At head of cover title: Department of the Interior. Arthropoda, Fossil Cambrian Cambrien Canada Paleontology United States FC 02 0203 no. 14747 AEU 565.3 Bulletin of the United States geological survey CIHM/ICMH microfiche series, no. 14747 https://www.biodiversitylibrary.org/bibliography/38399 0665147473 10.5962/bhl.title.38399 CaOOCIHM