Published by National Academy of Sciences, 1968, 90 Pp., 1968
Seller: Eryops Books, Stephenville, TX, U.S.A.
Soft Cover. Softcovers; outer edges of wraps rubbed w/ several small chips along fore-edge of front wrap; minor shelfwear w/ small creases at corners of wraps and leaves; contents in good condition.
Published by National Academy of Sciences, 1970, 153 Pp., 1970
Seller: Eryops Books, Stephenville, TX, U.S.A.
Soft Cover. Condition: Good. Softcovers; owner's stamp; minor shelfwear w/ light scuffing of rear wrap; small tear in lowermost paper covering of spine; o/w in good condition.