Arbeidsomstandigheden / Arbo-bibliotheek Koninklijke Luchtmacht ; [voorw. W.C.M. Tielemans] tdck rapport Infrared : an annotated bibliography up to 1966 / comp. by H. Lieffering ; approved by W.J. van Westerhoven Light guns for A.P.C.'s and anti-aircraft : bibliography / W.G. van Voss