Grooved axes of Eastern Pennsylvania / John Witthoft and James Miller.

Chicago citation style
Witthoft, John. Grooved axes of Eastern Pennsylvania / John Witthoft and James Miller.. Retrieved from the Digital Public Library of America, https://archive.org/details/groovedaxesofeas00witt. (Accessed September 18, 2018.)
APA citation style
Witthoft, John, Grooved axes of Eastern Pennsylvania / John Witthoft and James Miller.. Retrieved from the Digital Public Library of America, https://archive.org/details/groovedaxesofeas00witt
MLA citation style
Witthoft, John. Retrieved from the Digital Public Library of America <https://archive.org/details/groovedaxesofeas00witt>.
Note: These citations are programmatically generated and may be incomplete.