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Volumes 1, 2, 5, 6, 10 are currently available from A.K. Peters. Please see www.aslonline.org/books-lnl-order-akpeters.html for more information.
Volumes 3, 8, 9, 11 and 12 are available from the ASL. See www.aslonline.org/books-lnl-ordering.html for ordering information. This site also contains information about ordering LNL books not available electronically published with either A.K. Peters or Cambridge University Press.