Watterson, Ray, L. <br/><br/>
Laboratory studies of chick, pig and frog embryo 
by Ray L. Watterson and Robert M. Sweeny 
 - 2nd ed. 
 - Minnesota  Burgess  1970 
 - v, 179p.; 38plates. ; 28cm. 
<br/><br/><label>Dewey Class. No.: </label>598.610433  / WAT