Editore: Field and Laboratory, Vol. 21, No. 3, 1953, Pp. 97 - 103 and 127., 1953
Da: Eryops Books, Stephenville, TX, U.S.A.
Reprint/offprint from journal; no covers; owner's stamp; minor shelfwear w/ light creasing of leaves; small chip on lower corner; o/w in good condition.