Peter Krapp created a list of thinkers including Locke, Leibniz, Hegel, Wittgenstein, Barthes, Michel Leiris, Georges Perec, and Lévi-Strauss who used index cards in his essay Hypertext Avant La Lettre on the precursors of hypertext.
see also: Krapp, P. (2006) ‘Hypertext Avant La Lettre’, in W. H. K. Chun & T. Keenan (eds), New Media, Old Theory: A History and Theory Reader. New York: Routledge: 359-373.
Notice that Krapp was the translator of Paper Machines
About Cards & Catalogs, 1548 – 1929 (MIT Press, 2011) by Marcus Krajewski. Which was writing about hypertext and index cards first? Or did they simply influence each other?