Physiological mysteries and revelations in love, courtship and marriage : an infallible guide-book for married and single persons, in matters of the utmost importance to the human race Becklard, Eugène. Sex Education Sexual Behavior New York : [s.n.], 1842 Howard, Philip M. Popular Works Text 112 p. nlm:nlmuid-02310210R-bk 02310210R http://resource.nlm.nih.gov/02310210R English The National Library of Medicine believes this item to be in the public domain : https://creativecommons.org/publicdomain/mark/1.0/