Many are listed in the online catalog in the Crumb Library. Three bodies which produce reports of interest on science policy questions are the Congressional Research Service, the Office of Technology Assessment, and the U.S. Congress. Committee on Science and Technology. Books, articles, government documents, etc. that you discover but which are not in the Crumb Library can usually be obtained through Interlibarry Loan. These will take, on average, a week to ten days to receive.
Much information is also available in electronic form.
Among the databases searchable online are PAIS, Enviroline, Environmental Bibliography, Energyline, and Pollution Abstracts. Remember that there is someone at the Information Desk to give you additional help when you need it.