11/26/2011 12:01 pm ET Updated Nov 26, 2011

Rob And Beverly Elliot, Colo. Couple, Will Return Rare Book About Aztec, Mayan Culture Purchased On Their 1972 Mexico Honeymoon

A book bought by a Grand Junction, Colo. couple on their 1972 honeymoon in Mexico City for $50 is now heading to the National Institute of Anthropology and History due to its rarity and colorful illustrations that appear to explain Aztec and Mayan calendars, The Denver Post reports.

Rob and Beverly Elliott purchased an unbound 1907 book titled "Los Calendarios Mexicanos" by celebrated Mexican historian Mariano Fernandez de Echevarria Veytia who lived between 1720 and 1778, according to the Grand Junction Sentinel. The book uses reproductions of illustrations that date back to the 1500s and only six known copies exist today in reasonable condition.

The clerk that sold them the unbound book thought that the young married couple would simply take care of it -- which they did, keeping it in a cedar chest for all these years, bringing it out only on rare occasion.

The Elliots understood how important the book is to Mexican heritage and decided to give it back to Mexico so it could be learned from. 7News reports that next week the couple will give the book to a Mexican official who will take it to the National Institute of Anthropology and History to study its contents.