Methods of mathematical physics / by Harold Jeffreys ... and Bertha Swirles Jeffreys ... Jeffreys, Harold, 1891-1989. Jeffreys, Bertha Swirles, author. Mathematics. Mathematical physics. QA401 .J4 530.15 JEM Includes most of Harold Jeffreys' "Operational methods in mathematical physics" and "Cartesian tensors." cf. Pref. Cambridge [Eng.] : The University press, c1946. c1946. 1946 Text vii, 679 p. : eng