The NYPL is a great, useful resource. HOWEVER, the previous post shows the caution one should have in deciding to leave books/papers to libraries or museums. Note to protect the collection, S.A.M. members had to REMOVE it from the neglect of an otherwise fine, facility.
Please read Leo Behnke's "The Conservation of Magic", or Nicholson Baker's. "Double Fold-Libraries assault on Paper". They show(truthfully) across the country, "libraries" are dumping ROOMS of books and papers, they feel have little interest. When some donate a collection, they now include an endowment to fund preserving it, and legal papers, securing the preservation of the material. It is frightening to know the disregard these "guardians" can have, including, "some magic stuff" in the back room they could use the room for. To improve(?) the new San Francisco downtown library, they spent millions on a new building, and dumped,(destroyed) 200,000 books in a land fill, because they took up too much room.(in a library!)
Unbelievable, but true...please use caution in dealing with different institutions.