encyclopedias

Contains forty-nine articles that provide information about various aspects of geology, covering the subdisciplines of geophysics, tectonics, petrology, volcanology, and others; arranged alphabetically from alluvial systems to magmas.

Over 400 alphabetical entries, with illustrations, maps, and charts, cover such scientific topics as acid rain, computers, numbers, and sound.

Presenting the Indian tribes that have existed in North America since prehistoric times, this book includes the region, language, dwelling and subsistence type for each tribe as well as a discussion of their history, culture and way of life.

A complete reference tool which provides information in major fields of science and engineering.