You may send a book, magazine or newspaper through the mail. Make sure to put the name that they use at the correctional facility, DIN # and location. The material may go through a media review procedure in the package room to make sure it is appropriate.
Here is a link about what is allowed and not allowed to be sent to correctional facilities. Information on books/newspapers/magazines can be found under Educational Supplies - printed material http://www.doccs.ny.gov/FamilyGuide/AllowableItems.html
This link will tell you about media review guidelines - what kind of books, newspapers and magazines are allowed and not allowed http://www.doccs.ny.gov/Directives/4572.pdf