Finally, a comprehensive fish identification guide covering the fish-rich reefs of the Pacific. It contains 2,500 underwater photographs of 2,000 species from four of the best marine life authors/photographers in the business. Their collaboration makes it possible for underwater naturalists to identify fishes from Thailand to Tahiti with a single, compact, easy-to-use, no-nonse...(展开全部)

This book is a full-scale exposition of Charles Manski's new methodology for analyzing empirical questions in the social sciences. He recommends that researchers first ask what can be learned from data alone, and then ask what can be learned when data are combined with credible weak assumptions. Inferences predicated on weak assumptions, he argues, can achieve wide consensus, w...(展开全部)

Plant identification employs an extensive and complex terminology. Professional botanists often need several years in the field to master this terminology, and it presents a daunting obstacle to the student of botany. The meaning of most botanical terms, however, is immediately apparent when an illustration is available. That is the purpose of this volume. Plant Identific...(展开全部)

In antiquity Samarkand was the capital of the Persian province of Sogdiana. Its language, culture, and Zoroastrian religion closely approximated those of the Persians. Following its conquest by Alexander, its strategic position and fertile soil made Sogdiana a coveted prize for Late Antique invaders of Central Asia. Around 660 CE at the dawn of Arab invasion local king Varkhuma...(展开全部)