I don't know of any books, but I have some suggestions.
Find your local mops (mothers of preschoolers) group or other mothers group.
Find some good reading books, educational, entertainment, etc...
Take an online college course
Remember that it is ok to leave the kids at a day care or with a relative for a couple hours a week to go shopping, relax, get your hair done, go to a spa, coffee with girlfriends, "me time" for you
Remember that you are being productive and are an important part of your children's lives. You are not without a career. Your career is a household engeneer, professional shopper, child specialist, etc... You don't get a paycheck you can cash at the bank, but you get paid in hugs and kisses now and some hugs and kisses and other benefits are going into your savings account and retirement fund. :)
Make play dates with friends old or new for your little ones
Take them to the park and on long walks
Plant a garden with the two year old. If you don't have a good/safe place in the ground, grow some veggies in containers. I grow tomatoes, bell peppers, lettuce, artichokes, etc... Maybe there is a veggie she doesn't care much for, but if she grows it, she might like it.