Aircrew flight operation/cruising guide cards for the USAAF TB-25 (North American B-25 'Mitchell') aircraft. Set of 4 cardboard cards approximately 14 x 8cm. These appear to have information about the aircraft's engines pertaining to different loading scenarios. They have information on RPM limits, climb data, maximum range and so on, Probably carried on the aircraft to be used as an aide-memoire. The cards are in excellent condition and come in the original paper envelope. Stock code P20302.