Böhler, H. Reimer, Dietrich Vohsen, Ernst, Usambara- and coastal area in the districts Tanga, Pangani and Wilhelmstal : in 4 sheets / Drawn by H. Böhler. Ed. by the Imperial Government of Deutsch-Ostafrika Berlin : Dietrich Reimer (Ernst Vohsen). - 4 ct : Lithogr. - Sheet A / after the photographs of the Usambara survey conducted by land surveyors Böhler, Röpke, Lange and Techner until the end of 1909, constructed at the R e i c h s k o l o n i a l a m t with the cooperation of ... Hahn and the ... Schleicher and Brückner by H. Böhler. - 1:100 000. - Berlin : Dietrich Reimer (Ernst Vohsen) , [1910]. - 1 ct : Lithogr. ; 77 x 62 cm With 2 deck pauses. - With contour lines and shading. Accompanying report to this ct. see in the cs. for surveying 1911, special print by Konrad Wittwer, Stuttgart, map of the Usambara and coastal area, lithograph, 1911* subtitle: Weser, Annekathrin (photographer); Böhler, H.; Reimer, Dietrich; Vohsen, Ernst, 1911