Ayer directory of publications. 

 - Philadelphia  Ayer Press  1977. 
 - 1262 p.  maps. 
 - 
<br/><br/><label>Subjects--Topical Terms: </label><br/>American newspapers--Directories.<br/>Periodicals--Directories--United States<br/>Periodicals--Directories--Canada<br/>Canadian periodicals--Directories.<br/>Canadian newspapers--Directories.<br/>American periodicals--Directories.