Correlation Papers: Cambrian Page: 3
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UNITED STATES GEOLOGICAL SURVEY
J. W. POWELL, DIRECTOR
CORRELATION PAPERS
CAMBRIAN
BY
CHARLES DOOLITTLE WALCOTTWASHINGTON
GOVERNMENT PRINTING OFFICE
1891
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Walcott, Charles Doolittle. Correlation Papers: Cambrian, report, 1891; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc957827/m1/3/?rotate=270: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.