In this passage of Luke, it seems like the Book of Isaiah was on its own individual scroll. Do we have historical evidence or references that show whether this was always the case, or if some Books of the Old Testament were combined prior to the second century A.D.? 

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> Luke 4:17 "the scroll of the prophet Isaiah was given to him. He
>  unrolled the scroll and found the place where it was written"
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I have been to a Jewish synagogue service before and the Torah scroll they brought out for the Torah reading was huge, but also contained the entire Pentateuch on a single scroll. I'm not sure if that is just a modern practice, or occurred historically as well.