observer's military vehicles directory observer's military vehicles directory from 1945 / research and ed. by Bart Harmannus Vanderveen [and] Olyslager Organisation source book of military tracked vehicles / comp. by the Olyslager Organization; edited by Bart H. Vanderveen olyslager auto library Armour on wheels to 1942 / comp. by the Olyslager Organisation ; ed. by Bart H. Vanderveen observer's fighting vehicles directory observer's army vehicles directory to 1940 / research and editing by Bart H. Vanderveen [and] Olyslager Organisation BV
