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Biography of Ludwig Lachmann (1906-1990)
http://www.mises.org/Lachmann.asp
From the Mises Institute.
Ludwig Lachmann
http://en.wikipedia.org/wiki/Ludwig_Lachmann
Wikipedia article.
Ludwig Lachmann's The Market as an Economic P
http://www.auburn.edu/~garriro/r8lachmann.htm
Review article by Roger Garrison in Critical Review.
Ludwig M. Lachmann
http://cepa.newschool.edu/het/profiles/lachmann.htm
Article in the History of Economic Thought website.