- Erskine, Donald J., “Audio-visual Materials in Interpretive Programs,” Trends, 1:11–12, 1964.
- Greenburg, Bradley S.; Raainsky, Edward L., “Some Effects of Variations in Message Quality,” Journalism Quarterly, 43:486–492, 1966.
- Jackson, Grace, Cynthia Ann Parker, The Naylor Company, San Antonio, Texas, 1959, 170 pp.
- Kuehner, Richard A., “A Prospectus for Improved Interpretation of Ancient Bristlecone Pine Forest and the White Mountains of California,” unpublished Master's Thesis, University of Michigan, Ann Arbor, 1966, 125 pp.
- Mahaffey, Ben D., “Interpretation–the Missing Ingredient?” Trends, 5:9–11, 1968.
- McLuhan, Marshall, Understanding Media, McGraw-Hill, New York, 1964, 350 pp.
- Sharik, Terry L., “Establishing and Developing the Self-guiding Trail as an Interpretive Media in Urban Areas–a Case History,” unpublished Master's Thesis, University of Michigan, Ann Arbor, 1966, 78 pp.
- Skrabanek, R. L., “A Decade of Population Change in Texas,” Publication B-1000, Texas A & M University, College Station, Texas, 1964, 32 pp.
- Tilden, Freeman, Interpreting Our Heritage, The University of North Carolina Press, Chapel Hill, 1967, 120 pp.
- Wagar, J. Alan, “Quality in Outdoor Recreation,” Trends, 3:9–12, 1966.
- Weaver, Howard E., “State Park Naturalist Programs; Their History, Present Status, and Recommendations for the Future,” unpublished PhD Thesis, Cornell University, Ithaca, New York, 1952, 632 pp.
Environmental Education
Volume 1, 1970 - Issue 4