1962-1966 2 volumes. [2], 56, 61, v p., 3, 7 figs, 14, 20 pls, paperbound. Ex library Dr. A.C. van Bruggen (with his stamp). Very good set.
1974 58 p., 1 fig., 4 pls, stapled. Published in: Archiv Molluskenkunde. Ex library Dr. A.C. van Bruggen (with his stamp).We added two other papers published in Arch. Moll. by Zilch: Microna Ziegler in Frauenfeld 1863 ((3 p.) & Landschnecken aus Peru (11 p., 12 figs, 2 pls).
1975 ix, 278 p., 4to, printed soft cover. This volumes covers the year 1971 and includes some additions to previous years. A chip in the front wrapper fore edge, otherwise a very good clean copy.
1925 168 p., 61 text figures, 12 plates, 3 coloured maps, quarter cloth over marbled boards, original printed covers bound in, handwritten label on spine. With Cor Karnekamp’s ex libris on pastedown. Small Norwegian institute’s stamp on the title, otherwise excellent, clean.This is the thesis of the Norwegian malacologist Fridthjof Johannes Økland (1893-1957), as indicated by a mounted, printed label with additional handwriting.