I don’t know how they did it in 1961. Do you?
How did the Polk Directory know that Madelyn Dunham was the “loan interviewer & escrow Bank of Hawaii” or that Stanley Dunham was “mrg Pratt Furniture”?
I have read a bit about Polk’s methods, yes.
But the onus is not on me. I am not the one positing that SAD personally informed Polk that she was a student when she was not, and that Polk uncritically printed her lie without any crosschecking or verification.