Publication coverage: Varies by titleKnovel is a searchable database of more than 5,000 engineering and applied science handbooks and other reference works.
Publication coverage: 1909 to presentScience of Synthesis provides access to the largest collection of evaluated organic synthetic methods available worldwide.
Publication coverage: 2021, 2005 - 2014, and some earlier
Publication coverage: Varies with publication.JSTOR archival journal collections include thousands of journals in the humanities, social sciences, and sciences.
Publication coverage: 1701-1800A digital collection of significant English-language and foreign-language titles printed in during the eighteenth century.