Settlement Pattern of the Great Basin (unknown source)

A dear friend provided me with tons of data to help in my research.  This image was part of it, the source is unknown but I think it originated somewhere in the archives of BYU or The Church History Archives.  Date unknown, based on the number of communities on the map, it is likely a very early one.

It’s a handwritten map showing the migration route into the Salt Lake Valley, the staging area for newcomers, from there different routes to different settling areas with the mileage written in black ink.