Relativity. Theory.
**E .5129a.1 Birkhoff, George David, 1884- , and Rudolph Ernesi Langer. Relativity and modern physics. — Cambridge. Harvard University Press. 1923. 283 pp. Dia- grams. 22 cm. Bibliography, pp. 271-276.
This card was printed at the Boston a Public Library, May 8, 1923.
M6298 — T.r. — Jt. auth. — Relativity. Theory.