Correlation papers Devonian and Carboniferous

by Williams, Henry Shaler
Published 1891

The classification of the lower Carboniferous rocks of the Mississippi Valley ... /

by Keyes, Charles Rollin (1864-1942).
Published 1892

<<The>> permo-carboniferous Red Beds of North America and their vertebrate fauna /

by Case, E. C. 1871-1953
Published 1915