Frémont submitted the report of his 1843–1844 expedition to the U.S. Senate in March 1845; it was published by early August 1845. (Frémont, Report of the Exploring Expedition, 2–6; “Captain Fremont’s Report,” Daily National Intelligencer [Washington DC], 7 Aug. 1845, [2].)
Frémont, John C. Report of the Exploring Expedition to the Rocky Mountains in the Year 1842, and to Oregon and North California in the Years 1843–’44. Washington DC: Gales and Seaton, 1845.
Daily National Intelligencer. Washington DC. 1800–1869.