This is the original study: https://digital.library.unt.edu/ark:/67531/metadc799207/m2/1/high_res_d/vol20-no3-191.pdf
This is the continuation too:
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This is so cartoonishly racist it's literally the kind of thing I'd expect in a sitcom.
Thanks for the whole pdf link this is fascinating (both the actual study and the blatant, disgusting racism)
I read some of the other cases and they are indeed fascinating, if a little saddening.
There are quite a few tear-jerkers. The one that got me was right at the beginning in case 2: