Jared Farmer, author of On Zion's Mount: Mormons, Indians,and the American Landscape (Harvard, 2008) has published a free e-book titled Mormons in the Media, 1830-2012. It looks like a great resource for teaching and for research, described as "a free educational e-book archive of nearly 500 images about Mormons and Mormonism in U.S. politics and the public sphere, from Joseph Smith to Mitt Romney."
Mormons in the Media, the e-book's website explains, "considers both outside views of Mormons—including historic anti-Mormon propaganda—and media images promulgated by Latter-day Saints themselves. This topical reference work also features a preface, a fact sheet, a list of suggested readings, and bibliographic citations." The collection comprises a vast range of visual media.
Here's a link: www.stonybrook.edu/mormons-media
Check it out!