Natural family planning

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Billings, J. J. (1978). Natural family planning. Papua and New Guinea Medical Journal, 21(4), 286-287.

Billings JJ. Natural family planning. P N G Med J. 1978;21(4):286-287.

Billings, J. J. "Natural family planning." Papua and New Guinea Medical Journal, vol. 21, no. 4, 1978, pp. 286-287.

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