“NATURE’S BALANCE KEEPERS.” 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. 170–182, www.jstor.org/stable/10.5749/j.ctttt869.23. Accessed 13 Aug. 2020.
McKenny, M., & FISHER, C. (1939). NATURE’S BALANCE KEEPERS. In Birds in the Garden and How to Attract them (pp. 170-182). Minneapolis: University of Minnesota Press. Retrieved August 13, 2020, from www.jstor.org/stable/10.5749/j.ctttt869.23
McKenny, Margaret, and CLYDE FISHER. "NATURE’S BALANCE KEEPERS." In Birds in the Garden and How to Attract Them, 170-82. Minneapolis: University of Minnesota Press, 1939. Accessed August 13, 2020. www.jstor.org/stable/10.5749/j.ctttt869.23.
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