1976, Geology, Illinois State Geological Survey Educational Series 11, 39 p., very good paper.
Published by Iowa Geological Survey, Iowa City, Iowa, 1975
Seller: Cambridge Books, Cambridge, MN, U.S.A.
First Edition
Soft cover. Condition: Fair. 1st Edition. 29 leaves : illustrations ; 28 cm. Very interesting and very rare. Lacks the folded map. This copy ex libris and well festooned wtih library marks and taped into a card folder. Date is estimated.
Published by United States Government Printing Office, Washington, 1979
Condition: very good. from the foreword, "The year 1979 is not only the Centennial of the U.S. Geological Survey it is also th eyear for the quadrennial meeting of the International Congress on Carboniferous Stratigraphy and Geology, which meets in the United States for its ninth session." softcover, 11" tall x 8.5", black marker on cover.