{"value"=>"<p>This series contains Jackson's original diaries for the period of his service in the Union Army, 12th Vermont Regiment, Company K (1862-1863); the summer spent photographing along the line of the Union Pacific Railroad in Nebraska, Wyoming and Utah (1869); his first field excursion as unofficial photographer with the United States Geological Survey in the Wyoming Territory (1870); and fragmentary diary notes for his final summer with the Survey in Yellowstone (1878). The series also contains five diaries covering his world tour with the World's Transportation Commission, 1894-1896; three of the five are devoted to the Siberian portion of the trip. These are accompanied by transcripts of the diaries, typescripts of two articles Jackson wrote about his experiences on the trip, and twenty-nine photographs taken in India, Korea, and New Zealand. Finally, there is one diary, 1901, covering three months spent in California, Oregon, and Washington shooting and purchasing photographs for the Detroit Publishing Company, and twenty volumes of diaries kept during his retirement, 1925-1942. Some of the 19th century diaries contain his sketches and doodles, which are not always reproduced in the transcripts.</p> <p> The series also includes Jackson's transcripts and reconstructions of his diaries for 1866-1867, 1873, 1874, and 1875. The original diaries are in the Stephen H. Hart Library of the Colorado Historical Society in Denver.</p> <p>Finally, the series contains typed narratives made by Jackson during the preparation of his memoirs. Some recount the same material covered by the diaries and transcripts; others cover periods for which there are no diaries extant.</p> All the material in this series has been arranged in rough chronological order according to the time period of the subject matter. Jackson's original diaries are accompanied by transcripts and narratives covering the same period, even though the latter may have been prepared many years later."}