I happened on this book by accident, and it is wonderfully written for anyone who knows television and, of course, The Mary Tyler Moore Show and its hillarious cast.
LateBloomer...Aquamarine, this is worth buying or certainly requesting at your local library.
As the book so brilliantly explains, CBS execs were "fearful" of topics of the time like women's lib etc. Of course, we we know, the Mary Tyler Moore Show went on to be one of CBS's most lucrative and celebrated shows.