- Ashbaugh, Byron L. Planning a Nature Center (National Audubon Society, 1963).
- Ashbaugh, Byron L., illustrated by Robert F. Holmes, Trail Planning and Layout (National Audubon Society, 1965).
- Shomon, Joseph J. A Nature Center for Your Community (National Audubon Society, 1962).
- Shomon, Joseph J. Manual of Outdoor Conservation Education (National Audubon Society, 1964).
- Shomon, Joseph J., editor. Manual of Outdoor Interpretation (National Audubon Society, 1968).
- Shomon, Joseph J., Ashbaugh, Byron L., Tolman, C. D., sketehes by Ned Smith, diagrams by Robert F. Holmes. Wildlife Habitat Improvement (National Audubon Society, 1966).
- Tilden, Freeman. Interpreting Our Heritage (North Carolina, University of North Carolina Press, Chapel Hill, 1957).
Environmental Education
Volume 1, 1969 - Issue 2