Publicado por Memoire du B.R.G.M., no. 77, 1972, pp. 663-677., 1972
Librería: Eryops Books, Stephenville, TX, Estados Unidos de America
Soft cover. Reprint/offprint; softcovers; minor shelfwear and light scattered foxing; o/w in good condition.
Publicado por Revue de Micropaleontologie, vol. 15, no. 2, 1972, pp. 75-114., 1972
Librería: Eryops Books, Stephenville, TX, Estados Unidos de America
Soft cover. Reprint; softcovers; minor shelfwear w/ light creasing of corners of wraps and leaves; o/w in good condition.
Publicado por International Geological Congress, 1972, 650 pp., 1972
Librería: Eryops Books, Stephenville, TX, Estados Unidos de America
Soft Cover. Condición: Good. ORIGINAL PUBLICATION; Softcovers; light creasing of corners of wraps and pages; small tear in fore-edge of front wrap; o/w in good condition.