Buying Old Books - $250 (russian hill)

Hello readers.
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I am always hunting for important old books of all kinds.
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ideally signed first edition books.
Hard Cover primarily.
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but also Artist catalogs / zines and limited edition small-run books.
Condition is everything : dont contact me with items that are moldy or damaged.
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only pristine items that have been well cared for please.
I buy constantly and I pay a fair price in cash or Venmo.