The Messenger, July 1960, No. 51.
Bishops
“Attention Called To ‘Book of Mormon’ Maps”
Our attention has been brought in the past few weeks to certain “Book of Mormon Lands” maps which are being offered to Church leaders and auxiliary workers by a California organization. They are apparently being distributed free of charge.
We wish to refer bishops to the printed matter at the bottom of the map, which contains an inference that there are two, rather than one, Hills Cumorah — one in Mexico as well as the one in New York.
The Church has never accepted this contention.
Bishops are requested to make cognizant of this discrepancy those in their wards who might be sending for these maps or using them for instructional purposes. This concept of two Cumorahs should not be taught as official Church doctrine.
[Source: http://emp.byui.edu/marrottr/Cumorah-JFeS-DofS3.htm ]