Gee that was hard to find. A paper by Sanger and adamant promotion of BIRTH CONTROL over abortion.
"The knowledge of Birth Control methods may for a time be denied to the woman of the working class, but those who are responsible for denying it to her, and she herself, should understand clearly the dangers to which she is exposed by the dark age laws which force her into the hands of the abortionist. To understand the more clearly what these dangers are, and to realize the more fully how much better it would be to avoid them, it is first necessary that women should know something of the processes of conception, the prevention of which frees them of all risk of having to resort to abortion."
http://www.nyu.edu/projects/sanger/webedition/app/documents/show.php?sangerDoc=232534.xml