Ueber Vorstellungstypen / von Ludwig Pfeiffer.

Experimentelle Untersuchungen über qualitative Arbeitstypen / von Ludwig Pfeiffer.

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Pfeiffer, Ludwig, 1872-

Works from the collections

Ueber Vorstellungstypen / von Ludwig Pfeiffer.

Experimentelle Untersuchungen über qualitative Arbeitstypen / von Ludwig Pfeiffer.