I would recommend anything by Katie Thear, her wrtingin style is perfect for anyone starting out, without being at all patronising, and I learn something new from it every time I delve in. You'll probably find it very cheaply on Amazon.

Another one that was recommended to me (which I haven't got yet, but it's on the list) is Diseases of Backyard Poultry - then you'll know more than the vet!

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Dwell simply ~ love richly