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Basic practicalities of natural family planning in terms of of international symbols 0I0 por Ganar, Linda

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Calendar method unreliable in family planning, study says

Standard days method bagong paraan ng natural na pagpaplano ng pamilya

Periodic abstinence in the Philippines new findings from a national survey por Laing, John E.

And they call it "rhythm" the practice of periodic abstinence in Bicol and the Visayas regions por Logarta-Avila, Josephine

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