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The National Technical Information Library is a federally funded bibliographic science and technology research information database. To search the database and to download full text pdf's you will need to create a FREE account, which limits you to 10 downloads per search session. Currently there are more than 850,000 documents digitized for free public access.
The National Center for Biotechnology Information advances science and health by providing access to biomedical and genomic information in a number of public access databases. Topics you may research using these resources include nucleotide and protein sequences, protein and chemical structures, genomes, taxonomy, etc.
"OSTI.GOV makes discoverable over 70 years of research results from DOE and its predecessor agencies. Research results include journal articles/accepted manuscripts and related metadata; technical reports; scientific research datasets and collections; scientific software; patents; conference and workshop papers; books and theses; and multimedia. OSTI.GOV contains over 3 million records, including citations to 1.5 million journal articles, 1 million of which have digital object identifiers (DOIs) linking to full-text articles on publishers' websites. OSTI.GOV provides access to this DOE STI by offering numerous easy-to-use search capabilities and customization options; and for the DOE community, additional citation information is available to help researchers evaluate article impact and find related research." -- website
"Science.gov searches over 60 databases and over 2200 selected websites from 15 federal agencies, offering 200 million pages of authoritative U.S. government science information including research and development results." -- Science.gov website
"The Technical Report Archive & Image Library (TRAIL) identifies, acquires, catalogs, digitizes and provides unrestricted access to U.S. government agency technical reports." -- TRAIL website
" The mission of TRAIL is to ensure preservation, discoverability, and persistent open access to government technical publications regardless of form or format. TRAIL provides unrestricted access to these digitized technical reports through the TRAIL Search Interface (link is external). Millions of pages of elusive technical reports are now discoverable, thanks to the collaborative effort of TRAIL members." -- TRAIL website
"BIOSIS Previews serves your every need for finding life sciences references. It consists of 1.8 million records relevant to working biologists, from journals, patents, conference reports and books, and in fully indexed and searchable form." -- website
PapersFirst is an index to scholarly papers presented at conferences, symposia, workshops, and other professional meetings from October 1993 to the present. It covers only those papers received by the British Library Document Supply Center. (NOTE: Search ProceedingsFirst to locate information on the meetings at which these papers were presented.)
ProceedingsFirst is an index to the publications of professional meetings, such as conferences, workshops, and symposia, held since October of 1993. It covers only publications received by the British Library Document Supply Center. (NOTE: Search PapersFirst to locate information on the individual papers presented at these meetings.)
"Google Patent Search covers the entire collection of issued patents and millions of patent application made available by the USPTO—from patents issued in the 1790s through those most recently issued in the past few months. We don't currently include international patents, but we look forward to expanding our coverage in the future." -- Google
"This database lets you access 91 years of [Canadian] patent descriptions and images. You can search, retrieve and study more than 2,080,000 patent documents. The text of the abstracts and claims is not available for patents that were granted prior to August 15, 1978. These patents can only be searched by their patent number, titles, owner or inventor names, or classification." -- from website
"Espacenet offers free access to more than 90 million patent documents worldwide, containing information about inventions and technical developments from 1836 to today. It has a user-friendly interface available in almost all European languages. It enables users with little or no experience in patent searching to obtain an overview of the state of the art, to follow new developments or to find out who invented what." - European Patent Office