Niklas Luhmann’s Zettelkasten Method One Pager (1968)

The internet is now rife with what I call zettelkasten method one pagers that describe what many people rightly (or very often wrongly) think that Niklas Luhmann s zettelkasten method entails. While doing some research about Luhmann s numbering system s antecedents, I recently came across a one pager (typescript) written by Luhmann himself in the form of