There are many good books about pregnancy and childbirth out there, but the ones most commonly known and sold in bookstores--What to Expect When You're Expecting and Your Pregnancy Week-by-Week--do not, I find, help to dispel women's fears or prepare pregnant mothers for natural childbirth without medical interventions. These books do:
Barbara Harper, RN Gentle Birth Choices
Ina May Gaskin, CPM Ina May's Guide to Childbirth
Penny Simkin, PT The Simple Guide to Having a Baby
Penny Simkin, PT The Birth Partner
Pam England, RN, CNM Birthing from Within
I recommend these books with all of my heart and mind!