Gras, Norman Scott Brien <br/><br/>
The early English customs system :  a documentary study of the institutional and economic history of the customs from the thirteenth to sixteenth century / 
by Norman Scott Brien Gras 
 - Cambridge :  Harvard University Press,  1918- 
 - v. ;  21 cm. 
<br/><br/> Library has vol.18 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Customs administration--Great Britain<br/>Tariff--History--Great Britain