Niklas Luhmann’s Zettelkasten Method One Pager (1968) (opens in new tab)

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