Geology and mineral resources of the Curwensville quadrangle / by George H. Ashley

Chicago citation style
Ashley, Geo. H. (George Hall), 1866-1951. Geology and mineral resources of the Curwensville quadrangle / by George H. Ashley. Retrieved from the Digital Public Library of America, https://archive.org/details/geologymineralre00ashl. (Accessed December 12, 2018.)
APA citation style
Ashley, Geo. H. (George Hall), 1866-1951, Geology and mineral resources of the Curwensville quadrangle / by George H. Ashley. Retrieved from the Digital Public Library of America, https://archive.org/details/geologymineralre00ashl
MLA citation style
Ashley, Geo. H. (George Hall), 1866-1951. Retrieved from the Digital Public Library of America <https://archive.org/details/geologymineralre00ashl>.
Note: These citations are programmatically generated and may be incomplete.