Heath, Philip R. <br/><br/>
An introduction to homotopy theory via groupoids and universal constructions  / 

 - Ontario:  Queen's University,  1978 
 - iv, 118p. 
 - Queen's papers in Pure and Applied Mathematics   no. 49 .
<br/><br/><label>Dewey Class. No.: </label>514  / H438.IH