This publication, covering a field of southwestern interest hitherto unworked, has had material assistance from Governor Thos. E. Campbell, himself a student of Arizona history, especially concerned in matters of development. There has been hearty cooperation on the part of the Historian of the Mormon Church, in Salt Lake City, and the immense resources of his office have been offered freely and have been drawn upon often for verification of data, especially covering the earlier periods. There should be personal mention of the late A.H. Lund, Church Historian, and of his assistant, Andrew Jenson, and of Church Librarian A. Wm. Lund, who have responded cheerfully to all queries from the . There has been appreciated interest in the work by Heber J. Grant, President of the Church, and by many pioneers and their descendants.
The Mormon Church maintains a marvelous record of its Church history and of its membership. The latter record is considered of the largest value, carrying out the study of family genealogy that attaches so closely to the theology of the denomination. During the fall of 1919, Andrew Jenson of the Church Historian's office, started checking and correcting the official data covering Arizona and New Mexico settlements. This involved a trip that included almost every village and district of this State. Mr. Jenson was accompanied by LeRoi C. Snow, Secretary to the Arizona State Historian and a historical student whose heart and faithful effort have been in the work. Many corrections were made and many additions were secured at first hand, from pioneers of the various settlements. At least 2000 letters have had to be written by this office. The data was put into shape and carefully compiled by Mr. Snow, whose service has been of the largest value. As a result, in the office of the Arizona State Historian now is an immense quantity of typewritten matter that covers most fully the personal features of Mormon settlement and development in the Southwest. This has had careful indexing.
