Vol. s5-25, Issue 146, 1933February 01, 1933 EDT
Erosion Surfaces in South-Central Pennsylvania
Erosion Surfaces in South-Central Pennsylvania
William Orville Hickok,
Hickok, W. O. (1933). Erosion surfaces in south-central Pennsylvania. American Journal of Science, s5-25(146), 101–122. https://doi.org/10.2475/ajs.s5-25.146.101