Anmerkung: | 2 v. in 1 Cover-title "Reprinted from Papers of the Michigan academy of science, arts and letters, vol. xii, 1929, v. xiv, 1930 "Reprinted from Papers of the Michigan academy of science, arts and letters, vol. xii, 1929, v. xiv, 1930." |
In: | "Reprinted from Papers of the Michigan academy of science, arts and letters, vol. xii, 1929, v. xiv, 1930." |
