Gregg, John R <br/><br/>
The language of taxonomy: An application of symbolic logic to the study of classificatory systems 

 -  Columbia University Press  1954 
 - 70 p.  diagrs. 
<br/><br/>Sets. Sets of ordered pairs, or relations. Hierarchies. An introduction to taxonomic systems. The structure of taxonomic systems. Taxonomic systems and taxonomic categories. 
<br/><br/><br/>Inglés 
<br/><br/><label>Subjects--Topical Terms: </label><br/>ZOOLOGÍA/toxomía