UFO Case Reports: “National UFO Reporting Center State Report Index For UT”

(National UFO Reporting Center, Davenport, Washington)

NUFORC presents UFO sighting reports covering the period 
30 June 1944-13 November 2013:

http://www.nuforc.org/webreports/ndxlUT.html

Map of Utah (lib.utexas.edu)

(lib.utexas.edu image)