Killearn Kitties got it! It was:

In this age of wonderful discoveries and rapid development,
our girls are called upon to keep well up with the times and
in touch with life in all its progress. They now enter the
regular college, and in addition to the studies, take part in
many if not all of the athletic sports of the boys.

from The American Girl's Handy Book



Any guesses on decade or year of publication?