Dr. John Billings AM (5 March 1918-1 April 2007) was an Australian doctor who pioneered the natural method of family planning known variously as the Billings Ovulation Method, the Ovulation Method, or the Billings Method
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"John Billings Quotes." Quotes.net. STANDS4 LLC, 2015. Web. 13 Oct. 2015. <http://www.quotes.net/authors/John Billings>.