The forts of Old San Juan  San Juan National Historic Site, Puerto Rico 
produced by the Division of Publications, National Park Service. 
 - Washington, D.C.  U.S. Dept. of the Interior  1996. 
 - 79 p.  ill., maps  21 cm. 
<br/><br/><label>ISBN: </label>0-912627-62-X (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Fortification--History.--Puerto Rico--San Juan
<br/><br/><label>Subjects--Geographic Terms: </label><br/>San Juan P.R..--Buildings, structures, etc.<br/>San Juan National Historic Site San Juan, P. R..<br/>Puerto Rico--History--To 1898.