These are the textbooks that we suggest you have for your 4th year OB/GYN rotation:
"Obstetrics and Gynecology", 7th Edition
Authors: Beckmann, Ling and Barzansky
Publisher: Lippincott Williams and Wilkins, Baltimore and Philadelphia, 2014
(Required reading for some lectures)
Authors: Cunningham, MacDonald, Gant, Leveno, Gilstrap
"Obstetrics Normal and Problem Pregnancies"
Authors: Gabbe, Niebyl, Simpson
Publisher: Churchhill Livingstone
"Novak's Textbook on Gynecology"
Authors: Novak, Jones & Jones
"Te Linde's Operative Gynecology"
"Practical Gynecologic Oncology: 4th Edition"
Authors: Jonathan Berek and Neville Hacker
Publisher: Lippincott Williams & Wilkins