This is the current situation regarding magic books at the New York Public Library.
Almost everything that comprises the magic collection has been held offsite in New Jersey for the last few years.
Type MZC as the call number into the link below to see the whole list of 1284 items. http://catnyp.nypl.org/search/
Originally it was just until the new Theatre Collection space at Lincoln Center was all tricked out. (It is a nice space to research.) Then the holdings faced a conflict over space and demand. On site they decided to keep 'The Encyclopedia of Magic and Magicians,' 'Magic Magazines of the Second Millennium' and 'The Annals of Conjuring.' Maybe a couple of others. In the rare book room you can read Mr. Caveney's 'Carter the Great' delivered with white gloved reverance.
A complete file of Mahatma trussed up in string has to be unceremoniously bounced around on a shuttle from New Jersey and it can take days to arrive. You can only order up 5 items at a time from this spectral holding. And only three bound volumes of a magazine are permitted per order. A regular black hole of data. (I've never been asked for my S.A.M. credentials by the way.)
These books have been boxed for so long, librarians freely admit they do not know what is lost, misplaced or escaped. They also admit they will never be re-integrated into easily accessible Manhattan stacks.
I did hear a rumor that the Parent Assembly was attempting to extricated some of the holdings. Tom Klem maybe? I hope, hope this is true. I can't describe or count the frustrations I've encountered with the current system.
If anyone in NY is trying to pull out some of these titles from the abyss and would like a Manhattan resident to help join the cause, please drop me a line.
p.s. Many items at the 42nd St branch that escaped straight magic classification, e.g. 'FitzKee's Contact Mind Reading Exposed,' have been very carefully removed by a razor blade. Thanks jackass.