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From TypeLabs
Psychological Type Interpretation and Development from Jung to Today with Peter Geyer

...cal types over a number of years in the early part of the 20th Century, starting with extraversion a introversion, later adding the four functions or mental activities of sensation, intuition, thinking and feeling. Responses to this work occurred e. g. Hinkle (1923), before the publication of his seminal Psychological Types (1921/ 1923)
This presentation is a history of the different
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