I agree also. Those people wanted their knowledge shared and you are doing it. Exceptionally well.
I do have a good bit of Bogard paperwork. Things like cancelled business checks and stubs written to all the places they got sand, fuel, cullet, and that sort of thing from. Payroll checks and stubs, invoices to buyers, invoices from suppliers, bills of lading, and other stuff. If there is any interest in it I'm always glad to share photos. Some of it is interesting, purchases of marbles from Vitro and MK and sales to champion and other places. It's also interesting to see who bought industrial marbles... places like Atari, pharmaceutical companies, spray paint companies, etc...