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Ullmann's is complementary to Kirk-Othmer as a great source of chemical information. It covers a wide range of subject areas: inorganic and organic chemicals, advanced materials, pharmaceuticals, polymers and plastics, metals and alloys, biotechnology and biotechnological products, food chemistry, process engineering and unit operations, analytical methods, environmental protection, and more. It tends to have a more European focus than Kirk-Othmer.
Essential Science Indicators ranks scientists, institutions, countries, and journals according to citations. It also includes the most highly cited papers and citation analysis (for analyzing research trends).
All nine volumes of the Treatise on Geochemistry, which covers major topics in geochemistry ranging from the mantle and core to oceans to planets, are now available online.
In Comprehensive Organometallic Chemistry III, experts in the field sifted through the literature of the last decade and synthesized it and put it in context for you.