Encyclopedias are great for:
A searchable database of hundreds of reference books covering the social sciences including such areas as economics, gender, race, history, politics, psychology, research methods, social policy, sociology and urban studies.
Provides searchable full-text e-book versions of many reference works, including multi-volume encyclopedias, handbooks, dictionaries, etc. in a wide range of subject areas including environment, history, law, multicultural studies, science, and social sciences.
Wikipedia can be very helpful in providing information about all kinds of topics, including detailed lists of disasters, classified by type. The footnotes and lists of external links provided at the end of many articles may lead to useful scholarly material.
CAUTION: The text of each article is not always accurate or authoritative. Articles often reflect personal opinion and controversial interpretations of events and issues. Authors might not have a strong academic background in the subject matter of the articles they contribute.