Editore: ca. 1952, 1952
Da: Willis Monie-Books, ABAA, Cooperstown, NY, U.S.A.
Softcover. Condizione: Very Good-. Off Print. Ex-museum library copy with ink stamp on the front cover. ; Reprinted from the Journal of Paleontology, Vol. 26, No. 5, September, 1952. Original paper covers.
Editore: ppb1st, 1980
Da: forest primeval, Cherry tree, PA, U.S.A.
Prima edizione
gd. gd.