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Published 1928
Problem of the Upper Nile : map of the Bahr el-Gebel /
:
Includes 1 ancillary map on the middle right corner: Plan of Gebel Zeraf Cuts, Scale 1: 50, 000 (black and white; 26 x 21 cm).
Includes references.
Relief shown by shading and spot heights. :
72p.,pages of figs : color, 1 map ; 101 x 81 cm, on sheet (110 x 87 cm)