Geology Writings, 1892-1913, undated

“Observations in Pennsylvania, Sept. 23-26, 1913,” 1913, 4 p. “The Rate of Glacial Erosion,” after 1892, 2 p. “Perhaps the clearest and most interesting...” undated, 17 p. (part of larger work?) “The Physical Conditions in North America during man’s Early Occupancy,” undated, 12 p. “Physical Geography of Palestine,” undated, 9 p.