This directory includes .zip and .tar files with all the individual time series from the NBER Macro--History Database. Except in very special circumstances you would be better off getting the individual series as you need them from http://nber.org/databases/macrohistory. On the WWW any individual series can be identified and retrieved with the URL: http://www.nber.org/databases/macrohistory/data/NN/FILE.db where NN is the chapter number (the first two digits in the FILE name) and file is the name below before the colon. e.g.: http://www.nber.org/databases/macrohistory/data/01/a01005a.db for the Index of Crop Production. When citing for publication please refer to the NBER Macrohistory Database and give the complete URL for all the series used. feenberg@nber.org A more insightful catalog (showing the role played by each variable in the macro-aggregates) is available for $35 from: Publications Department NBER 1050 Mass. Ave. Cambridge MA 02138 orders@nber.harvard.edu ( 617-868-3900