I found this at the library a few weeks ago and am going to add it to my personal library. Its a guide to calving and the most in depth, simple, and understandable book I have ever read on the subject of animal birth.
Essential Guide to Calving
By Heather Smith Thomas
This covers absolutely everything, even complicated medical procedures (best performed by a vet), and every disease under the sun for cows giving birth. A must if you want to breed cows.