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Trent Nelson | The Salt Lake Tribune Retiring LDS Church historian Marlin Jensen on Wednesday, Oct. 3, 2012, at his home in Hunt Trent Nelson | The Salt Lake Tribune Retiring LDS Church historian Marlin Jensen on Wednesday, Oct. 3, 2012, at his home in Hunt Trent Nelson | The Salt Lake Tribune Retiring LDS Church historian Marlin Jensen on Wednesday, Oct.3, 2012, at his home in Hunts Trent Nelson | The Salt Lake Tribune Retiring LDS Church historian Marlin Jensen on Wednesday, Oct. 3, 2012, at his home in Hunt Trent Nelson | The Salt Lake Tribune Retiring LDS Church historian Marlin Jensen and his wife, Kathleen, with a family portrait Trent Nelson | The Salt Lake Tribune Retiring LDS Church historian Marlin Jensen on Wednesday, Oct. 3, 2012, at his home in Hunt Tribune file photo In this 2008 photo, Elder Marlin Jensen holds a journal that contains dictated and handwritten entries from Jos Scott Sommerdorf | The Salt Lake Tribune Flag bearing names of those families who had family members killed in the Tribune file photo In this 2009 photo, Hyrum Smith's Hebrew Old Testament Bible is shown. Tribune file photo A collection of volumes of "Americana History of the Mormon Church" is on display in this 2009 photo. Tribune file photo Wooden crosses adorn the black wrought iron fence that surrounds the Mountain Meadows Massacre Grave Site Memor Tribune file photo In this 2009 photo, LDS Church Historian and Recorder Marlin Jensen presents Elder Russell M. Nelson of the Qu Tribune file photo In this 2009 photo, LDS Church Historian and Recorder Marlin K. Jensen points out original handwritten documen Richard E. Turley Jr., left, assistant church historian for The Church of Jesus Christ of Latter-day Saints, answers a question as Tribune file photo LDS Church President Thomas S. Monson laughs while hugging Church Historian Marlin K. Jensen before dedication