(Washington : Government printing Office, 1873). 8vo. In later half cloth with the original wrappers pasted on to boards. From "Mittheilungen aus der norddeutschen Seewarte", von W. von Freeden. Abstract, translated from the "Revue maritime et coloniale". July, 1873. Stamp to front board and first leaf of text. 12 pp. + folded chart.