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Yerkes's massive report on IQ testing in the US Army (1921)
Attached:
https://ia600303.us.archive.org/10/items/psychologicalexa00yerkuoft/psychologicalexa00yerkuoft_bw.pdf

Anyone who doubts that the Flynn effect includes a "real" increase in intelligence ought to just look at the sample tests from 1917.

Philbrick
I would be very interested if someone can look at these tests & do a systematic analysis –- e.g., subtest-level scores, g loadings. The report is massive and poorly organized, so it's hard to find that stuff.
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