Academic Search Complete is the world's most valuable and comprehensive scholarly, multi-disciplinary full-text database, with more than 6,100 full-text periodicals, including more than 5,100 peer-reviewed journals. In addition to full text, this database offers indexing and abstracts for more than 10,100 journals and a total of more than 10,600 publications including monographs, reports, conference proceedings, etc. The database features PDF content going back as far as 1887, with the majority of full text titles in native (searchable) PDF format. Searchable cited references are provided for more than 1,000 journals.
"American Memory provides free and open access through the Internet to written and spoken words, sound recordings, still and moving images, prints, maps, and sheet music that document the American experience. It is a digital record of American history and creativity. These materials, from the collections of the Library of Congress and other institutions, chronicle historical events, people, places, and ideas that continue to shape America, serving the public as a resource for education and lifelong learning." from web site
Resources compiled by the Australian National Botanic Gardens.