@oclsc @histoftech your description fits for me. I think there's something about the geography of a physical book that an e-reader cannot emulate: that key paragraph was about a third of the way through, on the right-hand page, near the bottom. (I think I was forever turned off digital formats for reference books when I thought I was being clever bringing Lonely Planet PDFs for a travel adventure; the format was completely unusable in the field.)