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To date the manuscripts, researchers have used such techniques as comparing their contents with inscriptions on coins, and names or events mentioned in other texts. Similar sleuthing suggests that the Kharosthi scrolls came from the library of a Gandharan monastery of the Dharmaguptaka sect of Buddhists; that they date from the first century AD; and that they were found in modern-day northern Pakistan or eastern Afghanistan. Interlinear notations such as "copied" indicate that the manuscripts were discarded ones that had been replaced by freshly made ones. Apparently, says Mr. Salomon, the monasteries had well-organized scriptoriums and large libraries even at that early stage