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  1. Aug 2022
    1. https://scottscheper.com/letter/36/

      Clemens Luhmann, Niklas' son, has a copy of a book written in German in 1932 and given to his father by Friedrich Rudolf Hohl which ostensibly is where Luhmann learned his zettelkasten technique. It contains a 34 page chapter titled Die Kartei (the Card Index) which has the details.