A comprehensive guide to all current modern football tactical formations.

Properly understanding and characterizing geologic materials and formations is vital for making critical engineering decisions. Identifying and classifying rock

The first field guide that allows amateur rock enthusiasts to identify basic rocks and rock formations in a systematic way Many of us are fascinated by rocks—

From high school games to the NFL, this guide features the basics of offense and defense, players, rules, strategies, and even what to wear. New coverage for th