Below are selected indexes and information sources for working papers in economics.

For working papers at the Social Science Library see:
SSL Working Papers Collection
Economic Growth Center Working Papers Collection

AgEcon Search - Electronic Working Papers in Agricultural Economics
A library of literature pertaining to both agriculture and economics.

Econlit
Contains Abstracts of Working Papers in Economics

EconWPA Working Papers Archive
The award winning service, provided by the Economics Department of Washington University, devoted to the free distribution of working papers in economics.

IDEAS - Internet Documents in Economics Access Service
Searchable archive of economics working papers broken down by working paper series and subject (JEL) category. Search results indicate if the full-text of the paper may be downloaded.

Social Science Research Network (SSRN)
SSRN elibrary consists of two parts: an abstract database containing abstracts on over 112,400 scholarly working papers and forthcoming papers and an electronic paper collection with over 84,400 PDF documents.