One thing that can be done with much of the old punchcard data is to divide the catch estimate by the expansion factor. The factor was often listed on the catch data page. That way, you have the number of fish that were actually reported. So, for example, you really don't know if 20,000 were harvested in the Skagit, you do know that a minimum of (say) 9,876 were caught and you can also know the number taken each month if monthly catch were reported.