Other helpful websites:
Spanish Missal online: laverdadcatolica.org
Zipoli Institute (includes recordings for practice): ZIPOLI
Amicus sponsi: Introitus
Spanish Bible online (Biblia Latinoamerica): http://www.sobicain.org/shell.asp UPDATE! CURRENTLY WEBSITE IS UNDER CONSTRUCTION
Marello.org (Fr. Matthew Spencer’s work). Note: this website may be found by accessing archive.org records.