From the Scout Report: This fascinating collection of social hygiene posters (designed to inculcate certain social practices regarding hygiene, friendship, prostitution, and mental health) is culled from the fine holdings of the Social Welfare History Archives at the University of Minnesota Libraries.

There are some gems to be found here, and the collection is easily browsed. Consider "Beware of Chance Acquaintances" and "Danger in Familiarities".

American Social Hygiene Posters, ca. 1910-1970