Soft covered book titled NORTH DAKOTA GEOLOGICAL SOCIETY SASKATCHEWAN GEOLOGICAL SOCIETY, WILLISTON BASIN SYMPOSIUM in Bismarck, North Dakota, October 9-12, 1956, 1st Reprint April 1961, 202 pages. The technical discussions presented at the Symposium, together with all maps, diagrams, and cross sections used, have been reproduced and included in the written material in this book. This book is in Fair condition, pages intact. There is no cover. The binding is loose, but all pages are intact. Foxing present on the end pages. Pages are slightly yellowed from age.