The Philosophy of Science: An Encyclopedia.
(online; print version: Olin Reference Q 174.7 .P45 2006)
Find articles on all aspects of the philosophy of science including biographical articles on philosophers of science.
Encyclopedia of philosophy and the social sciences.
It is not only about the philosophy of the social sciences but, going beyond that, it is also about the relationship between philosophy and the social sciences (publisher).
Routledge Encyclopedia of Philosophy Online.
(online; print version: Olin Reference B 51 .R68 1998)
Find articles on philosophers and philosophical topics. Strong coverage in ethics. Online version regularly updated.
Encyclopedia of Environmental Ethics and Philosophy. 2nd ed. 2006.
(online; print version: Mann Library GE42 .E53 2009)
Articles address all aspects of environmenal ethics.
The International Encyclopedia of Ethics 2013
This 9-volume set comprises over 700 entries, written by an international cast of subject experts.
Encyclopedia of Ethics. 2nd ed. 2001.
(Olin Reference BJ 63 .E45x 2001 +)
A three volume set on all aspects for ethics and related topics.