The Family History Library has not acquired copies of Wyoming newspapers. The library has copies of a few publications that contain abstracts of vital information printed in newspapers. Genealogical and historical periodicals also publish some obituaries and other extracts from early newspapers.
The Wyoming State Archives at http://wyoarchives.state.wy.us/, the Wyoming State Library at http://www-wsl.state.wy.us/, and other major libraries in Wyoming have helpful collections of newspapers. The following guides can help you locate Wyoming newspapers:
Guide to Wyoming Frontier Newspapers, Annals of Wyoming, Volumes 33-35 (1961-1963). Cheyenne, Wyoming: Wyoming State Archives, 1923-. (FHL book 978.7 B2aw volumes 33-35.)
Homsher, Lola. Guide to Wyoming Newspapers, 1867-1967, Cheyenne, Wyoming: Wyoming State Library, 1971. (FHL book 978.7 B3h; film 873822 item 2.)