| Stock, S., 1936. Perissodactyla of the Sespe Eocene, California. Proceedings of the National Academy of Sciences of the United States of America 22 (5): 260-265
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| Stock, S., 1933. An amynodont skull from the Sespe Deposits, California. Proceedings of the National Academy of Sciences of the United States of America 19 (8): 762-767
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