I have just come to find out that one of the most important publications on Spanish heraldry and genealogy has had its entire series posted online for download, for FREE!
This journal, published by the Real Asociación de Hidalgos a fuero de España, started in 1953 and continues to be in print, compiling some of the most important information on the topics of our interest for Spain and the Spanish world. Some of the older issues contain information that is absolutely critical to whomever is doing genealogical research on Spanish ancestry.
One can subscribe to the journal to receive the hardcopy or receive a PDF via email for a nominal fee. I had been a subscriber for years first for the hardcopy and later for the digital edition.
In any case, the link to the complete series online is http://hidalguia.ariasmontano.es/hidalguia.html