Theory of Zipf's Law and Beyond

Zipf's law is one of the few quantitative reproducible regularities found in economics. It states that, for most countries, the size distributions of cities and of firms are power laws with a specific exponent: the number of cities and of firms with sizes greater than S is inversely proportional to S. Zipf's law also holds in many other scientific fields.

This reference provides in-depth explanations and examples of more than 3000 musical terms and topics, including biographies of composers. Spanning early history to the present day the dictionary contains explanations of terms, illustrations of instruments, repertory for the various instruments, pronunciations of foreign terms and composers and inclusion of charts presenting additional information on principal ballets, operas and symphonies.

Biology: An Illustrated Guide to Science

Containing six sections, a comprehensive glossary, a Web site guide, and an index, "Biology" is an ideal learning tool for students and teachers of science. Full-colour diagrams, graphs, charts, and maps on every page illustrate the essential elements of the subject, while parallel text provides key definitions and step-by-step explanations. The content units: Unity, Continuity, Diversity, Maintenance, Human biology and Ecology.

This new three-level series edition offers just the right balance of explanations and practice. The Basic level presents clear, concise explanations followed by plenty of practice.
The Grammar Practice-Plus CD-ROM expands on materials covered in the texts.
Listen and Speak: Students hear sentences, select the correct response, and record their own voices.
Read and Write: Students practice identifying errors and correcting them.
Test and Review: Multiple choice tests help students check their progress.
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