Mormon History, Sep 20, 1848

Brigham Young: Arrived in Salt Lake Valley 20 September 1848.

[source: Cook, Lyndon W., The Revelations of the Prophet Joseph Smith: A Historical and Biographical Commentary of the Doctrine and Covenants, Seventy's Mission Bookstore, Provo UT, 1985, http://amzn.to/RevelationsofJosephSmith]
[Cook, Lyndon W., The Revelations of the Prophet Joseph Smith: A Historical and Biographical Commentary of the Doctrine and Covenants, Seventy's Mission Bookstore, Provo UT, 1985, http://amzn.to/RevelationsofJosephSmith]