"Card index" redirects here. For the rotating device used to store information, see Rolodex. For the note system used by writers, see Card file.
An index card (or record card in British English and system cards in Australian English) consists of card stock (heavy paper) cut to a standard size, used for recording and storing small amounts of discrete data. A collection of such cards either serves as, or aids the creation of, an index for expedited lookup of information (such as a library catalog or a back-of-the-book index). This system is said to have been invented by Carl Linnaeus, around 1760.[1][2][3]
^Cite error: The named reference ScienceDaily was invoked but never defined (see the help page).
^Müller-Wille, Staffan; Scharf, Sara (January 2009). Indexing Nature: Carl Linnaeus (1707–1778) and his Fact-Gathering Strategies(PDF) (Working paper). Department of Economic History, London School of Economics. p. 4. 36/08. See also the summary of the research project: "Rewriting the System of Nature: Linnaeus's Use of Writing Technologies". Centre for Medical History, University of Exeter. Retrieved 19 September 2022.
^Everts, Sarah (2016). "Information Overload". Distillations. 2 (2): 26–33. Retrieved 20 March 2018.
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