Publication date uncertain, no date on item. Date used is per Frank Motler, September 2009.
The cover lists a 10-cent price, but an internal promo invites teachers to request free copies for their students.
This 32-page comic includes a promo on page 23 for teachers requesting student copies. Pages 24-31 are taken up with details about Burks Pumps and Decatur Pump Company. This raises the possibility that there is also a 24-page school version, perhaps with page 32 (back cover) of this edition as page 24 (back cover) of that edition.
This issue has variants: