Lawful birth control : according to nature's law, in harmony with Catholic morality / by John A. O'Brien, with the assistance of Herman Knaus, Raoul de Guchteneere, Henry Schmitz.

Lawful birth control : according to nature's law in harmony with Catholic morality / by the Rev. John A. O'Brien, Ph.D ; with the assistance of Dr. Raoul de Guchteneere, Dr. Herman Knaus, Dr. Henry Schmitz.

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