Written to: The Minister of Scientific Research Salah Hidayyet
Date: September 21, 1963
The letter includes Fathy's suggestions for efficient roof construction in rural developmental projects.
Fathy, Hassan. Correspondence Regarding Folded-Slab Roofing. 21 Sept. 1963. Hassan Fathy Archives. Aga Khan Trust for Culture. Geneva, Switzerland.
Aga Khan Trust for Culture