Field notebooks, 1908-1946, of Henry J. Olk, a graduate of the Michigan College of Mines (now Michigan Technological University) in Houghton, Michigan. Includes three field notebooks, two of which date from his time at the College, while one is dated considerably later, probably while he was working as the City Engineer in Antigo, Wisconsin. Also includes a textbook, apparently compiled by Olk from a mining class.