Einstein, Albert, 1879-1955.
Sidelights on relativity [microform] / by Albert Einstein ... I. Ether and relativity. II. Geometry and experience, tr. by G.B. Jeffery, D. Sc., and W. Perrett, Ph. D.
Relativity (Physics)
1922.
Jeffery, G. B. (George Barker), 1891-
Perrett, W.