00680cam a22002291 4500 med48001375 DLC 20260227111611.0 810920s1948 xx a 000 0 eng med48001375 (OCoLC)14669497 DLC DNLM DLC premarc RG524 .V3 1948 WQ 100 V386m 1948 Vaux, Norris Wistar, 1881- The mechanics of obstetrics, by Mario A. Castallo. Philadelphia, F. A. Davis, 1948. xii, 217 p. ill. Earlier editions by Norris W. Vaux and Mario A. Castallo. Castallo, Mario Alberto, 1903- 39018 39018