Geologie der Err-Julier-Gruppe. I. Baumaterial (Stratigraphie ...), & II. Teil. Der Gebirgsbau, III. Teil. Quartär und Oberflachengestaltung ....
1950-51. Beitr. Geol. Karte Schweiz NF 70; 321+264+75 pp. 22+132+2 fig. 3 microphotoplts. 9 fold. & col. plts. w. sections. Orig. wrps. part I with repair of tear in front cover, otherwise very good, contents uncut, 4to.
1928. Diss. Univ. Leiden, (reprint Leids. Geol. Meded.); pp. 251-324 text in Dutch with French summary pp. 315-321, 5 fig. 2 plts. h.t. with phot. 1 fold. & col. map 1:25.000. Orig. wrps. very good, sm4to.