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1 ene 1904 año - 1904- Van de Velde- the first to point out the relationship between the wave-like fluctuations of the BBT and ovulation (1904)
Añadido al timeline:
NFP History
By
N. Husk
12 nov 2017
0
0
695
fecha:
1 ene 1904 año
Ahora mismo
~ 120 years ago
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