You did say 1200?
Wow! I thought my 158 was a lot. Clearly not. That means you have over 7 times the amount of cookery books that I have. That must take up a lot of space. Hope you live in a big house (or apartment)!
I'm a bit the same as you, in that I find it hard to give them up. There are some books which are beautiful artefacts in there own right. For example, I found a copy of Chez Panisse Cafe Cookbook by Alice Waters, in a charity (thrift) shop here. Its a first edition (mint). Its illustrated throughout with stunning coloured block prints by David Lance Goines. I'd find it tough to give that away!
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At the other end of the scale is my broken backed, bolognaise stained 1970's edition of 'Poor Cook' by Susan Campbell and Caroline Conran, which I've had since student days. How could I part with that?
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