Studies on the vegetation of the Transcaspian Lowlands. 1912. 79 figs. 1 foldg. sketch map. 279 p. gr8vo. - (Bound with): Studies in the Vegetation of Pamir. 1920. 79 figs. 1 sketch map. 130 p. gr8vo. Halfcloth. (The Second Danish Pamir Expedition conducted by O. Olufsen).