Vol. s5-36, Issue 213, 1938September 01, 1938 EDT
The Nebraska State Geological Survey and the “Valentine Problem”
The Nebraska State Geological Survey and the “Valentine Problem”
Alvin Leonard Lugn,
Lugn, A. L. (1938). The Nebraska State Geological Survey and the “Valentine problem.” American Journal of Science, s5-36(213), 220–227. https://doi.org/10.2475/ajs.s5-36.213.220