Due to Covid-19
We are working remotely and hope to ship orders once a week, but due to the circumstances it may take slightly longer. Print on Demand items and maps may also take longer.
For questions or tax exempt orders please email us at email@example.com
This series was focused on prompt release of recent investigations of the oil and gas resources of Illinois. Editions included significant results of research in oil and gas exploration and development that were comparable to Circulars in scope and endurance. The series could include annual reviews, bibliographies, and directories. It was published between 1926 and 2003 and is now closed; new submissions are published as Circulars.