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Lower Cambrian rocks in eastern California
Charles Doolittle Walcott

American Journal of Science February 1895, s3-49 (290) 141-144; DOI: https://doi.org/10.2475/ajs.s3-49.290.141
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The westward extension of rocks of Lower Helderberg age in New York
Samuel Gardner Williams

American Journal of Science February 1886, s3-31 (182) 139-145; DOI: https://doi.org/10.2475/ajs.s3-31.182.139
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On the geology of lower Louisiana and the rock salt deposit of Petite Anse
Eugene Woldemar Hilgard

American Journal of Science January 1869, s2-47 (139) 77-88; DOI: https://doi.org/10.2475/ajs.s2-47.139.77

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