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I'd think that it would be advantageous for most of them to not keep spreadsheets.

I imagine the highest level of drug dealers use not just spreadsheets, but probably things like QuickBooks.

They typically use these things called "prestigious accounting firms" and "major international banks."

... also some (but not all) of Robert’s Rules of Order:

Probably more likely than paper books. At least you can encrypt files on a disk.