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  1. By: Hartsog, William S. - Intermountain Forest and Range Experiment Station (Ogden, Utah)
    Publication info: Ogden, Utah, Intermountain Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1978
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Balloons  Idaho Batholith (Idaho and Mont.)  Logging  Logging, Aerial  Technological innovations
  2. By: Hartsog, William S. - Cass, James. - Intermountain Forest and Range Experiment Station (Ogden, Utah)
    Publication info: Ogden, Utah, Intermountain Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1979
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Logging  Logging, Aerial  Technological innovations