Ancient mythology isn't the only period that can boast of a hydra headed monster that grows two new heads whenever one is cut off (Collier's title) Mythology doesn't have a monopoly on the hydra-headed monster that grows two new heads whenever one is cut, MsC0170_250228-I. University of Iowa Special Collections. https://aspace.lib.uiowa.edu/repositories/2/digital_objects/1878 Accessed May 20, 2024.