Genealogists use digital scans of out of copyright books and records all the time. If the scan you have located online has pages or areas that are difficult to read, consider that another site may have scanned a different copy or the book or used a different scanning process.
It may also be necessary to see if a library can make a photocopy of that “bad page” or if a better scan is available through the original holder of the record.
No responses yet