by Wright, A. H., Rasmussen, A. T., Birge, Raymond T., Farr, Clifford H., Lange, N. A., Truog, E., Winger, R. M., Magath, T. B., Dove, L. P., Umpleby, J. B.
Published in Sigma Xi quarterly (01.12.1922)

by Umpleby, Joseph B.
Published in The Journal of geology (01.04.1913)

by Umpleby, Joseph B.
Published in The Journal of geology (01.02.1912)