A rarely-mentioned resource for historical research is the microfilm collection of the Genealogical Society of the Church of Jesus Christ of the Latter Day Saints located in Salt Lake City. This collection contains nearly one million rolls of microfilm of mostly parish and civil registers from throughout the world. Together with 134,041 volumes of books and manuscripts in the Library of the Genealogical Society, the collection constitutes the largest of its kind in the world—almost aweinspiring in its magnitude. Furthermore, over seventy microfilm camera teams are continually filming all over the world, with thousands of rolls of film processed each month. The purpose of this note is to acquaint Latin American scholars with the collection and its usage.