Download this PDF
Related documents
Device for determining female fertility periods
Patent 3.625.418
The book of nature
containing information for young people who think of getting married : on the philosophy of procreation and sexual intercourse, showing how to prevent conception and to avoid child-bearing : also, rules for management during labor and child-birth
Die verhütete Sexualität
Die Anfänge der modernen Geburtenkontrolle
Emko