Materiel instruction memorandum : The Firing Battery 155mm Howitzer M1 wereldmacht van het Witte Huis : de geheime documenten van Harry Hopkins, Roosevelts rechterhand / [door] Robert E. Sherwood ; geautoriseerde vert. van B. Koning Materiel instruction memorandum : The Firing Battery 105mm Howitzer M2 Materiel instruction memorandum : 75mm Pack Howitzer, M-1 Materiel instruction memorandum : The Firing Battery 75mm Pack Howitzer, M-1