Slide Box: 2 Small Boxes: Big Creek Drain Study-Arenac County (June 1979); 37 slides total; 4 Small Boxes: Consumers Power Study – Midland (June 1977-June 1978); 78 slides total; -Small Box 1: June-July 1977; 25 slides total; -Small Box 2: August-November 1977; 19 slides total; -Small Box 3: April-May 1978; 22 slides total; -Small Box 4: June 1978; 12 slides total; 1 Small Box: Faith Johnston at Greenhouse (April 1986); 20 slides total; 1 Small Box: Lakes – Michigan (August 1968-1976); 15 slides total; 1 Small Box: Lake Isabella – Michigan (October 1968-August 1974); 27 slides total; 1 Small Box: Nature – Michigan (1970-1979); 27 slides total; 1 Small Box: Trout Lake – Michigan (August 1968-1976); 26 slides total; 1 Small Box: Water – Michigan (May-November 1977); 25 slides total, undated