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» A Brief History of Programming Languages    A special Byte Magazine article published for Byte's 20th anniversary special report    http://www.byte.com/art/9509/sec7/art19.htm

» Computer Languages History    Timeline chart, 1954 to today, printable; links to homes of many languages.    http://www.levenez.com/lang/

» Diagram of Languages    Two diagrams showing how many languages are related to each other.    http://merd.sourceforge.net/pixel/language-study/diagram.html

» Historic Documents in Computer Science    Original, historic first documents for many early programming languages, like language manualsa, scanned and converted to PDF form.    http://www.fh-jena.de/~kleine/history/

» History and Comparison of Programming Languages    Papers on use history of: comments, labels, literals, parentheses.    http://www.gavilan.edu/csis/languages/history.html

» History and Evolution    A list of computer languages and some links to compilers for these languages.    http://www.scriptol.org/history.php

» O'Reilly: The History of Programming Languages    A poster plots over 50 programming languages on a multi-layered, color-coded timeline.    http://oreilly.com/news/languageposter_0504.html

» The Semicolon Wars    History and critique of disagreements over language design details, citing some specific traits; by Brian Hayes. American Scientist.    http://www.americanscientist.org/template/AssetDetail/assetid/51982/

» Visual Programming Languages: A Survey    This paper by Marat Boshernitsan includes an historical overview of some of the pioneering efforts in the field.    http://nitsan.org/~maratb/cs263/

» Wikipedia: PL/I    An encyclopedia description of PL/I history with many links to programming terms.    http://en.wikipedia.org/wiki/PL/I_programming_language