Natural family planning
Subtitle: introduction to the methods
By: by Clara R. Ross ; foreword by Rudolf F. Vollman.
Contributors: Human Life Foundation.
Publisher: Human Life Foundation
Published: 1977
Place of publication: Washington, D.C
Language: eng
Number of pages: 49
Subjects: Natural family planning -- Calendar method.; Menstrual cycle.; Ovulation -- Detection.
Notes: "References": p.46-49.