The geology and environment of the last million years.

A collection of scholarly entries on “how to plan and conduct empirical research, including the use of both quantitative and qualitative methods”.

Covers the knowledge from classics, philosophy, literature, literary theory, cultural studies, speech and communications, and discusses basic concepts and themes throughout rhetoric.

Focuses “on the key topics encountered by undergraduates and scholars in urban studies and allied fields."

The coverage from 1670 to 1815 includes Western Europe, North America, Brazil, and Iberian, Russian, Jewish, and Eastern European cultures.

Provides articles on all aspects of the period from the fifth to the fifteenth century.

"Encyclopedia Smithsonian features answers to frequently asked questions about the Smithsonian and links to Smithsonian resources. Covers topics in art, culture, science & techology."

A comprehensive tool for geophysicists, geologists, explorationists, engineers, energy advisers, economists, and students in the field. Provides access to the list of terms, definitions and associated figures, the search engine, the introductory texts, the appendices, and the references.

This multilingual, encyclopedic dictionary “covers terms regularly used in landscape and urban planning, as well as environmental protection.”

Detailed country, regional, and intergovernmental/non-governmental information.