For many years I had my own copy and having worked at a huge used book store in Minneapolis, I aquired numerous additional copies
Natural Birth Control
By (name escapes me) Stephan Gaskins wife,
from the Farm in Tenneses, fame.
A combination of basal body tempature, fertility of the vaginal mucus and
the monthly cycles of a woman.
Over 25 years of lovingly sharing equally the responsibility of birth control.
I/we (4 different partners at different periods of my life),
have never ever had a pregnancy scare
nor any of my women and men friends who I have shared the books, approach with.
Thats over 200 people.
Look up the Farm on line and see if they are still selling the book new.