* Hapgood, Charles Hutchins ; Mystery in Acambaro: An Account of the Ceramic Collection of the Late Waldemar Juisrud in Acumbaro, GTU, Self Published: Mexico, 1972.
* Hapgood, Charles Hutchins ; Mystery in Acambaro: Did Dinosaurs Survive Until Recently ?, 2000, Adventures Unlimited Press, ISBN 0-932813-76-3.
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