Laboratory studies of chick , Pig and rog embryos - Roy L. Watterson; Robert M. Sweeney (Minn Burgess Publishinhg Co, 1970)
Roy L. Watterson & Robert M. Sweeney: Laboratory studies of chick , Pig and rog embryos. (2rd Ed) Minn. Burgess Publishinhg Co, 1970. 8087-2326-X--(591.33WAT)
ENGLISH