Economics

Working Paper Series (National Bureau of Economic Research)
Full-text online from June 1973 to present.
Paper: Perkins/Bostock Periodicals W926G through 11/1999 (many are at the LSC)
Law Library: check individual title online catalog for call number.
Also indexed selectively in Abstracts of Working Papers in Economics and in Econlit. The paper issues at Duke are cataloged only under the series title (see the holdings under the main series entry in the library catalog), while the set at the Law Library is listed in the online catalog by the individual titles. Perkins titles, however, are virtually complete since #3940 through November 1999, with scattered issues before #3940.

EconPapers from RePEc (Research Papers in Economics) 
"World's largest collection of on-line Economics working papers, journal articles and software."

EconWPA
Another working paper gateway, arranged by the category codes used in the Journal of Economic Literature. No longer being updated, this is the archive of what was formerly at EconWPA.wustl.edu, formerly maintained by Bob Parks.

Federal Reserve Working Papers
Many of the working paper series from Federal Reserve district banks are included in the American Statistics Index (ASI) microfiche collection in the Perkins/Bostock Public Documents and Maps Dept.; you can get the fiche call number from the LexisNexis Statistical database (available on the web to Duke users). Many series are also online;  there are links to the district banks from the Federal Reserve Board of Governors web site.

International Monetary Fund (IMF) Working Papers
Selected IMF working papers are included in the Index to International Statistics (IIS) microfiche collection in the Perkins/Bostock Public Documents and Maps Dept.;  you can get the fiche call number from the LexisNexis Statistical database (available on the web to Duke users).  You can also retrieve the full text of some IMF working papers electronically from the IMF web site (choose "Working Papers" or other series in the "series" drop-down).

Institute for International Economics (IIE) Working Papers
Many titles in IIE's Working Paper Series are available full text from the IIE web site.

Duke University Department of Economics Working Papers
Online versions available back to 1995.  Formats vary: Acrobat, PostScript, and/or a word processing format.  Some that have been peer reviewed and subsequently published just have abstracts and a citation to the published version.  Many older numbers are available in the University Archives in the Rare Book, Manuscript, and Special Collections Library or directly from the author.

Wharton Financial Institutions Center Working Papers
At the University of Pennsylvania. Papers in recent years are all available full-text online, in Adobe Acrobat format.