A Group of Larviform Crinoids from Lower Pennsylvania Strata of the Eastern Interior Basin.
Urbana: State of Illinois, 1930. 8vo. 42 pp. Soiling, stamp near top edge of cover. Pages have damp wrinkling. Report of Investigations - No. 21. With booklet "On the Occurence of Platycrinus in Pennsylvanian Strata of Western Indiana" by same author included. Very Good Booklet (Item ID: 48782)