1926 iii, 119 p., 3 figs, 5 pls, publisher's cloth.
1921 vii, 152 p., 7 figs, 20 pls, paperbound. Published in: Verhand. Kon. Akad. v. Wetensch. te Amsterdam.
1930 116 p., 85, 40 figs, modern cloth (original printed covers bound in. Library stamps & markings.
1950 220 p., 145 figs, roy. 4to, paperbbound. Library stamps. Unopened copy.
1918 [6], 102, [1] p., 6 figs, 2 folded pls, cloth. Thesis. Library stamps on first end-papers. Fine copy of this scarce title.
2. Deventer/Antwerpen, Kluwer, 1993, in-8°, 961 pp + technical appendix, publisher's blue cloth with printed dust jacket. Nice copy.