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Working papers report research findings well in advance of formal publication. High-quality working papers are published by research organizations such as the NBER and CEPR, as well as by academic departments and nongovernmental organizations. The links below should help you to locate working papers available electronically.
Social Science Research Networkleading alerting and download service for working papers. Note that SSRN has a subscription component, but it is free to search and browse for papers, and most papers are freely downloadable.
Socionet.ru Working paper archive of Russian social science research
For sites not listed here, try EDIRC, a directory of economics institutes and research centers, or the Organizations tab.