When we purchased our first Dorpers, I began to look for books about sheep and discovered that there are not that many about (maybe sheep are not a sexy topic). I was looking for a book that could shed some light on the health problems we encountered and our management of  sheep for good health. Early on I discovered "The Veterinary Book for Sheep Farmers" by David Henderson
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The Author has been a Vet in the UK and America and the book covers just about everything to do with sheep. There are lots of drawings and photos that are helpful when attempting to diagnose a sheep illness. There is also very good information on lambing and its associated problems. The book was first published in 1990 so some of the information, such as worm management  is becoming outdated - as the problems of worm resistance are changing management practices. But, all in all it is an extremely useful book that is worth having on the bookshelf.