Officially called: Missae Propriae Diocesium Statuum Foederatorum Americae Septentrionalis, this is the 1962 Missale Romanum Insert for American Feast Days.
For use with the 1962 Missale Romanum (Extraordinary Form), this useful insert is one sheet of quality paper folded in half with black and red ink. The text is entirely in Latin. It has the proper Latin liturgical texts for special feasts like Our Lady of Guadalupe and St. Peter Claver and other feasts of saints who were from America celebrated in the Americas but not in other countries.
Since the size measures 5 1/2″ x 8″, it fits perfectly in our Travel Size Missale Romanum (item #RTMR). On the back is a adhesive strip which you can use to affix this “insert” of “American Feasts”.