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Printed Working Papers help you efficiently complete end-of-lesson, end of-chapter, and reinforcement activities as well as improved chapter study guides.

NEW Online Working Papers--identical to printed working papers, but completed online--provide you with immediate feedback and the convenience of working at a computer. Available exclusively with CENTURY 21 ACCOUNTING 9E.

The student guide to passing poetry and prose criticism in the AS and A Level English Literature exams. Leading Questions lends itself to a variety of teaching strategies such as group work, individual writing and coursework. It presents a wide range of prose and verse extracts, which together constitute a rich and varied anthology of predominantly modern writing.

Egyptian hieroglyphs, Chinese scrolls, and Ayurvedic literature record physicians administering aromatic oils to their patients. Today society looks to science to document health choices and the oils do not disappoint. The growing body of evidence of their efficacy for more than just scenting a room underscores the need for production standards, quality control parameters for raw materials and finished products, and well-defined Good Manufacturing Practices. Edited by two renowned experts, the Handbook of Essential Oils covers all aspects of essential oils from chemistry, pharmacology, and biological activity, to production and trade, to uses and regulation. Bringing together significant research and market profiles, this comprehensive handbook provides a much-needed compilation of information related to the development, use, and marketing of essential oils, including their chemistry and biochemistry. A select group of authoritative experts explores the historical, biological, regulatory, and microbial aspects. This reference also covers sources, production, analysis, storage, and transport of oils as well as aromatherapy, pharmacology, toxicology, and metabolism. It includes discussions of biological activity testing, results of antimicrobial and antioxidant tests, and penetration-enhancing activities useful in drug delivery. New information on essential oils may lead to an increased understanding of their multidimensional uses and better, more ecologically friendly production methods. Reflecting the immense developments in scientific knowledge available on essential oils, this book brings multidisciplinary coverage of essential oils into one all-inclusive resource.