Svensson, H. 1981. REMOTE SENSING The quantitative Approach. Ed. by Philip H. Swain & Shirley M. Davis. Mc-Graw-Hill Book Co. GmbH, Hamburg 1978. XI, 396 s. ill., 24 cm, DMB3, Floyd F. Sabins Jr.: REMOTE SENSING Principles and interpretation. W.H. Freeman & Co., San Francisco 1978, Univ. bogl., 426 s., ill., 28 cm, kr. 224,-. Geografisk Tidsskrift. 81, (jan. 1981).