Foerste, Grabau, and Ulrich

August F. Foerste, Amadeus W. Grabau, and Edward D. Ulrigh at the International Geological Congress in Washington, DC, 1934.

Source: Meyer, D. L. and R. A. Davis. 2009. A Sea Without Fish: Life in the Ordovician Sea of the Cincinnati Region. Indiana University Press: Bloomington, Indiana. 347 pp.