Rechenbehelfe erleichtern die neue Methode
Konzip Empfängnisrad basierend auf den Erkenntnissen von Hermann Knaus (MUVS Archiv)
Menstrual Calendar
Not only Knaus himself, but many other authors as well develop counting aids to calculate the ‘safe’ and ‘unsafe’ days. Knaus strongly insists that these records be maintained consistently for a minimum of twelve months, since natural processes do not run as regularly as an automated machine.
Menstrual calendar
Calendar, published by the medical science publishing house Wilhelm Maudrich, …
