AIUI the classic procedure for tasks like this is/was: Hide some graduate students. Tell each to transcribe, and to mark the difficult spots. Give each page to

AIUI the classic procedure for tasks like this is/was: Hide some graduate students. Tell each to transcribe, and to mark the difficult spots. Give each page to two students. Next, have someone else process the page pairs and resolve conflicts and the marked trouble spots. As long as one of the students notices that a particular spot is difficult to read, the error is discovered and can be handled by someone who isn't numb from transcribing pages of simple numbers.