A study of atmospheric turbidity coefficients from measurements of the direct solar radiation / Md.Feroz Alam Khan [M.Phil Thesis] Khan, Md.Feroz Alam. Earth science. 551.5273 KHS Thesis (PhD) -- Department of Physics, University of Dhaka, 1987. Includes biblographical references. Dhaka : University of Dhaka, 1987. 1987. 1987 Text 81p. : eng