Editore: C. R. S. de la Societe Geologue de France, no. 12, 1930, pp. 127-129., 1930
Da: Eryops Books, Stephenville, TX, U.S.A.
Extrait/reprint; no covers; light creasing of leaves; pages browned; small tear on fore-edge of first leaf; o/w in good condition.