Die Asterozoen in den Dachschiefern des rheinischen Unterdevons.
1957. Abhandlungen des Hessischen Landesamtes für Bodenforschung 21; 160 pp. 31 fig. 55 plts. Orig. wrps. libr. stamp on front cover, otherwise very good.
The blastoid Pentremites Say ? a trimerous mutant and some new occurrences. /&/ The Mississippian blastoid genera Phaenoschisma, Phaenoblastus, and Conoschisma.
1964. Journal of Paleontology 38-4; pp. 705-710, 2 fig. 1 plt. h.t. & pp. 711-724, 2 plts. h.t. Orig. extract with printed journal's covers, very good.