ON THE ORIGIN OF LONGITUDINAL (SEIF) DUNES.VERSTAPPEN H TH.1968; Z. GEOMORPHOL.; DEU; 1968(6), VOL. 12, NUM. 0002, P. 200 A 220Miscellaneous

HANDBUCH DER GEOMORPHOLOGISCHEN DETAILKARTIERUNG. = TRAITE DE CARTOGRAPHIE DETAILLEE GEOMORPHOLOGIQUEDEMEK Y; EMBLETON C; GELLERT JF et al.1976; WIEN; FERDINAND HIRT; DA. 1976; PP. 1-463; H.T. 2; BIBL. 15 P.; 109 ILL.; 2 CART.; ISBN 3701960011Book

Remote sensing for resources development and environmental management. Volume 3DAMEN, M. C. J; SICCO SMIT, G; VERSTAPPEN, H. Th et al.International symposium on remote sensing for resources development and environmental management. 7th. 1988, pp 959-1074, isbn 90-6191-677-1, isbn 90-6191-677-1Conference Proceedings

Remote sensing for resources development and environmental management, Enschede, 25-29 August 1986Verstappen, H. TH; Sicco Smit, G; Damen, M. C. J et al.International symposium on remote sensing for resources development and environmental management. 1986, 3 vol., XV-1074 p, isbn 90-6191-677-1Conference Proceedings