On another forum that I am a part of, there is a huge list of resources. I would check out your local library for any first. I would also suggest burning What to Expect. There is a lot of misinformation in in, and it is not very thorough in the topics that it does cover. This is a pretty long list, so I put stars by some of the essential ones. All of these books are great (I have not read all of them, but they come highly recommended).
Pregnancy:
Pregnancy Childbirth and the Newborn: The Complete Guide by Penny Simkin
The Complete Book of Pregnancy and Childbirth by Sheila Kitzinger
Mayo Clinic Guide to a Healthy Pregnancy by Mayo Clinic
Childbirth:
*Ina May's Guide to Childbirth by Ina May Gaskin
Birthing from Within: An Extra-Ordinary Guide to Childbirth Preparation by Pam England
*Natural Childbirth the Bradley Way by Susan McCutcheon
*Spiritual Midwifery by Ina May Gaskin
*The Thinking Woman’s Guide to a Better Birth by Henci Goer
A Good Birth, A Safe Birth by Diana Korte
Childbirth without Fear by Dick Grantly (out of print)
Gentle Birth Choices by Barbara Harper
The Birth Book By Martha Sears
Having a Baby, Naturally By Peggy O'Mara
*Hypnobirthing: The Mongan Method By Marie Mongan
The Birth Partner by Penny Simpkin
A Wise Birth by Penny Armstrong
VBAC & Cesaren:
Artemis Speaks:VBAC Stories and Natural Childbirth Information By Nan Koehler
*The Silent Knife by Nancy Cohen
History of Childbirth:
BIRTH: The Surprising History of How We Are Born by Tina Cassidy
Maternity Care System:
*Born in the USA: How a Broken Maternity System Must Be Fixed To Put Women and Children First by Marsden Wagner (A MUST READ!)
PUSHED: The Painful Truth About Childbirth and the Modern Maternity Care by Jennifer Block
*Obstetric Myths Vs. Reseach Realities by Henci Goer
Birth as an American Rite of Passage by Robbie Davis Floyd
Pursuing the Birth Machine by Marsden Wagner
Midwifery:
*Baby Catcher by Peggy Vincent (this is one of my favorite fun reads!)
A Midwife's Story by Penny Armstrong
Hearts and Hands: A Midwife's Guide to Pregnancy and Birth by Elizabeth Davis
Breastfeeding:
*The Womanly Art of Breastfeeding by La Leche League International
The Nursing Mother’s Companion by Kathleen Huggins
The Breastfeeding Book by Martha Sears
Mothering Your Nursing Toddler by Norma Jane Bumgarner
So That’s What They’re For: The Definitive Breastfeeding Guide By Janet Tamaro
How My Breasts Saved The World: Misadventures of a Nursing Mother By Lisa Shapiro
Fresh Milk: The Secret Life of Breasts by Fiona Giles
Parenting:
The Continuum Concept: In Search of Happiness Lost By Jean Liedoff
The Natural Child: Parenting From the Heart By Jan Hunt
*The Baby Book by Dr Sears
The Attachment Parenting Book by Dr Sears
Mother Rising The Blessingway Journey Into Motherhood
Natural Family Living by Peggy O' Mara