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Calculus is the key to much of modern science and engineering. It is the mathematical method for the analysis of things that change, and since ...
This easy-to-use identification guide to all of the 120 species of primate in Asia is perfect for resident and visitor alike.
High quality photographs from ...
This fully revised and updated identification guide to 280 bird species, including all resident and regular migratory species, occurring in Singapore is perfect for resident ...