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John P. Harrold
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Journal Articles
The American Biology Teacher (1956) 18 (3): 130.
Published: 01 March 1956
Journal Articles
Journal Articles
The American Biology Teacher (1952) 14 (6): 147–150.
Published: 01 October 1952
Journal Articles
The American Biology Teacher (1952) 14 (4): 98.
Published: 01 April 1952
Journal Articles
The American Biology Teacher (1948) 10 (7): 194.
Published: 01 November 1948