Gray, John,  1799-1883, <br/><br/>
The social system :  A treatise on the principles of exchange / 
By John gray 
 - 374 páginas 
<br/><br/> Facsimil de: edinburgh : william tait, 1831 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Economía
<br/><br/><label>LC Class. No.: </label>HB161  / G73