Design of a 21-foot spectrograph using a plane grating.
Richards, E. W. T,author.
Thomas, A. R.,author.
Weinstein, W,author.
Atomic Energy Research Establishment (Harwell, England),issuing body.
Great Britain.Her Majesty's Stationery Office.
"Jan. 7, 1957."
Sold but not published by H.M. Stationery Office.