Sentence:  First he collected a number of witnesses, including many old prints of the Guhyasamāja Tantra itself and old <WSD>xylograph</WSD> prints of the Pradipodyotana from  the monasteries of Drepung, Tashilhunpo, Riwo Dangchen, and Nartang. 
Meaning of the word marked with <WSD> tags:  An engraving in wood or woodcut, especially one used in printing predating the Western tradition ((14)).