Strand books has a great website -- www.StrandBooks (plus a dot com).
If you know what book you want, check its availability online before you go to the store -- you'll find the store that has it and the section in which it is shelved (or save yourself a trip!). The author search also works well.
I print out the information and take it with me. Oddly, I have found the staff is incredibly helpful if you have the basic info -- and WILL help you find the object of your desire if it is not shelved where it is supposed to be.
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