APA (7th ed.) Citation

(1920). Cretaceous and cenozoic Echinoidea of the Pacific coast of North America ..

Chicago Style (17th ed.) Citation

Cretaceous and Cenozoic Echinoidea of the Pacific Coast of North America .. 1920.

MLA (9th ed.) Citation

Cretaceous and Cenozoic Echinoidea of the Pacific Coast of North America .. 1920.

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