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منشور في 1948
"1935 Report on Lake Tsana outlet control works and Ethiopian highways from Addis Ababa to Lake Tsana /

: 176 pages : plates ; 34 cm.

منشور في 1947
Report on Lake Tsana outlet control works and Ethiopian highways from Addis Ababa to Lake Tsana /

: 152 pages : plates ; 34 cm.