Notes on the Qattara Power Scheme, [Egypt] / John Ball. 1931 May. [42p ts. + 2 graphs, bound in folder. With printed maps, plans and sections to accompany the notes (7 sheets, most in colour). Ball was Director of Desert Surveys, Egypt. ]
Notes on the Qattara Power Scheme, [Egypt] / John Ball. 1931 May. [42p ts. + 2 graphs, bound in folder. With printed maps, plans and sections to accompany the notes (7 sheets, most in colour). Ball was Director of Desert Surveys, Egypt. ]
