[Footnotes]

[Footnotes]
1
Miller, D. F., and G. W. Blaydes, Methods and Materials for Teaching Biological Sciences. N. Y.: McGraw-Hill Book Co., 1938, pages 402- 403
Miller
402
Methods and Materials for Teaching Biological Sciences
1938
2
Price, J. W., and E. V. Fowler. Science, 91: 271, 194010.2307/1666183
271
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