"Heinkel He III In Action," Squadron/Signal Publications, George Punka.
Paperback book with slick covers and pages. Details all aspects of the Heinkel He III aircraft. Heavily illustrated with period black-and-white photos. Line drawings with pointed details. Close-up photos. Filled with facts explaining each photo. Colored drawings are provided to display different paint schemes and markings of various nations' He III aircraft. An excellent reference.