SciFinder Scholar for the Web is an electronic version of Chemical Abstracts starting from 1907 to the present. All types of literature are indexed including journal articles, book, patents (from 32 patent-issuing agencies) technical reports, conference papers , and e resources. It includes more than 30 million substance records and CAS Registry Numbers. One can search the chemical literature by: authors name, research topic, substance identifier, chemical structure or chemical reaction. The complete Medline database from 1950 forward is also searchable through SciFinder Scholar. Registration is required to use this database.