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Fretwell, Mattie Bell (February 1937), "The Development of the Thermometer", The Mathematics Teacher, 30 (2): 80–83, doi:10.5951/MT.30.2.0080, JSTOR27952013
Fretwell, Mattie Bell (February 1937), "The Development of the Thermometer", The Mathematics Teacher, 30 (2): 80–83, doi:10.5951/MT.30.2.0080, JSTOR27952013