Gardening books

I'm new to this site, so sorry if this is a boring and/or faq.
I am looking for good, illustrative books on gardening. Being a absolute beginner I have no idea where to begin. Tried to searc but had a hard time finding anything of interest, probabl because I used the wrong search words.
I need some good books for my workplace, a concept company in Shanghai China, preferably with great pics in them.
Can anybody help me with this?
Thanks a lot,
-- Casper

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