{Hoping this is an acceptable area to post this} For those in range of a PBS station, I hope you caught the second part of Nova's "A to Z" two part series yesterday. https://www.pbs.org/wgbh/nova/series/a-to-z/ (If you missed it -- it might stream from that link). There were some interesting points... Like papyrus/reed-pen combination allowed for fairly rapid writing, so Rome had a high degree of scrolls available via libraries. But after the empire fell apart, lost ready access to papyrus. Parchment making was slow and costly (equivalent of four large pages per hide), AND required such a slow hand to write that scribes would be lucky to get two pages copied out per day! And the cost of having a scribe spend a year on a book was equivalent to buying a small home.