Alsos Digital Library for Nuclear Issues http://alsos.wlu.edu is hosted by Washington and Lee University; it contains annotated descriptions of books, articles, and other materials. It is affiliated with the Nuclear Pathways project.

Federation of American Scientists http://www.fas.org/nuke is an anti-nuclear group whose website contains the text of arms control treaties and other resources.

Nuclear Matters Handbook 2016 edition https://www.acq.osd.mil/ncbdp/nm/nmhb/index.htm is an online resource maintained by the US Department of Defense for US government employees working on issues related to nuclear weapons and nuclear power generation.

Nuclear Pathways http://www.nuclearpathways.org is a project that is part of the US National Science Digital Library. It gathers together a variety of information on historical and current nuclear weapons issues.