Reading Strabo's Geography, I am absolutely amazed! Not only by the easy to read content and critical analyses of his sources, which latter surely were not easy to evaluate given the scientific state of the times, but also by the physical research done: imagine putting all those sources together!
No file folders, no computer to keep one's notes organized and handy, only scrolls and tablets … ;-)
As to Homer, Strabo maybe could recite Homer verse by verse, what do you think?