Part III : Captivity #Section IV : Relations of prisoners of war with the exterior - Art. 39.
Art. 39. Prisoners of war shall be permitted to receive individually consignments of books which may be subject to censorship.
Representatives of the protecting Powers and of duly recognized and authorized relief societies may send works and collections of books to the libraries of prisoners, camps. The transmission of such consignments to libraries may not be delayed under pretext of difficulties of censorship.