N.Y. Comp. Codes R. & Regs. tit. 7, § 304.12 – General library services.

(a) Items selected from the general library shall be considered part of the maximum allowed as set forth in section 302.2(e) or 303.2(c) of this Title, whichever is applicable.
(b) Each facility will develop a system for the maintenance of an appropriate inventory record.

There shall be available to inmates in the SHU, general library materials in a quantity equal to at least two books and one magazine/periodical for each inmate. This reading material will be rotated in the special housing unit every 60 days.