These links will take you to library collections, which include documents on or related to sustainable development that can be searched online.

British Library for Development Studies
Canadian International Development Agency Virtual Library on International Development
DELNET -Developing Library Network
Environment Canada
Institute of Development Studies ELDIS Gateway to Development Information
International Development Research Centre
International Institute for Sustainable Development
National Library for the Environment
R4D Research for Development (DFID)
Regional Environment Center
Royal Roads University
SD-Gateway
Stockholm Environment Institute
World Bank Library Network
World Resources Institute