It's a shame they're not available digitally. A database would have been nice.
Regarding using averages.. i see some that do it that way and with success, but still, if there is anything like with the 32 hammerless then the first years of production will have a large chunk of the total made in terms of %.
Ah, wish 1899 was the limit here as well, would have made a lot of snacks accessible.
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