Estudio del sello conmemorativo del cuarto centenario del descubrimiento de Puerto Rico, 1493-1893
By: Ovidio Dávila.
Publisher: Casa del Sello
Published: 1991
Place of publication: Madrid
Language: spa
Format: Paperback
Number of pages: 112
Subjects: Commemorative postage stamps -- Puerto Rico -- History -- 19th century.; Puerto Rico -- Discovery and exploration -- On postage stamps.
Description: Historical analysis and philatelic plating of the postage stamp issued in Puerto Rico in 1893 to commemorate the 400 years of the discovery of that Island by Christopher Columbus in 1493.

This philatelic study also covers the aspects of the postal usage of this commemorative stamp ―the first authorized by the Spanish authorities―, and well as a description of the philatelic counterfeits. 

The author of this book is a very well known Puerto Rican philatelist, who is also a prominent archaeologist and respected historian.
Notes: Includes bibliographical references (p.111).