Palaeontology of Harrar province, Ethiopia. part 2. Echinoidea.
1943. Bull. Amer. Mus. nat. hist. 82-1; pp. 14-29, 11 fig. 2 plts. Includes Part 1: The Dudley Expedition by Barnum Brown, pp. 7-13, 2 photoplts. 1 double-page map. Orig. wrps. with libr. stamp.
Die Echiniden der westdeutschen Jurabildungen. I. Nachtrag zu den regulären Echinideneber Diluvialgeschiebe cenomanen Alters.
1872. Zeitschrift der Deutschen Geologischen Gesellschaft XXIV; pp. 615-648, 3 plts. h.t. with echinoids folding-out. Loose extract, margins of plates with some brown spots, otherwise very good.