“VALUE OF BIRDS, ESTHETIC AND ECONOMIC.” Birds in the Garden and How to Attract Them, by Margaret McKenny and CLYDE FISHER, NED - New edition ed., University of Minnesota Press, Minneapolis, 1939, pp. 1–18, www.jstor.org/stable/10.5749/j.ctttt869.3. Accessed 7 Aug. 2020.
McKenny, M., & FISHER, C. (1939). VALUE OF BIRDS, ESTHETIC AND ECONOMIC. In Birds in the Garden and How to Attract them (pp. 1-18). Minneapolis: University of Minnesota Press. Retrieved August 7, 2020, from www.jstor.org/stable/10.5749/j.ctttt869.3
McKenny, Margaret, and CLYDE FISHER. "VALUE OF BIRDS, ESTHETIC AND ECONOMIC." In Birds in the Garden and How to Attract Them, 1-18. Minneapolis: University of Minnesota Press, 1939. Accessed August 7, 2020. www.jstor.org/stable/10.5749/j.ctttt869.3.
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