I don't know if he is alive ... but I would check out his big self-published hardback book from 1993 for your article -- "Hager's comprehensive price guide to rare baseball cards, 1886 to present"
I think there are copies out there.
Kinda pricey on Amazon but maybe you can borrow?
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FYI;
I thought that Dave Foreman was the first person who embarked on professional grading -- his reputable "SCG" (?) was contemporaneous with Hagar's which was ACCUGRADE
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