Hayden, Seymour  <br/><br/>
Zermelo-Fraenkel Set Theory 
/ by Seymour Hayden & John F. Kennison 
 - Columbus, Ohio  Charles E. Merrill Publishing Company  1968 
 - 164p. 
<br/><br/><label>Dewey Class. No.: </label>517.521  / HAY/Z