København, Ejnar Munksgaard, 1958-1962. Large 8vo (27.0 x 21.0 cm). 419 pp. [129; 157; 96; 37] pp., 118 [34; 43; 30; 11] plates. Original uniform printed wrappers.

With numerous new species and excellent illustrations. Third volume uncut and thus a bit larger. Two covers (1st and 4th) signed by the author, the Danish mite expert Marie Hammer (1907-2002). "Marie Signe Hammer née Jørgensen (1907-2002) was a Danish zoologist and entomologist who specialized in moss mites. In the 1930s and 1940s, she undertook research in Iceland, the Faroe Islands and Greenland. She later extended her investigations to North and South America, New Zealand, and Asia, discovering some 150 new genera and almost a thousand new species. Her research supported the dispersal of species as a result of continental drift as described in her 1979 thesis together with John Anthony Wallwork, titled A Review of the World Distribution of oribatid mites in Relation to Continental Drift" (Wikipedia). A very good, complete set.