Database services provide access to full-text newspaper articles, peer-reviewed journal articles, scholarly reports, e-books or e-journals that pertains to a certain topic. These materials might have been first published in an international publication and later made available to one or more information services that aggregate these materials into a searchable database. These materials can exceed their normal print publication lifespan, reflecting a wide variety of historical materials.
Most full-text databases can be used to search on topics such as this. The below sources are just a few that can be utilized and can provide a good start for your research. The subscription resources marked with a padlock are available to researchers on-site at the Library of Congress. If you are unable to visit the Library, you may be able to access these resources through your local public or academic library.
Recently the Department of Commerce National Technical Information Service (NTIS) has begun offering the American public free public access to a searchable online database of approximately three million federal science and technology reports through the National Technical Reports Library (NTRL). Of the three million documents in the NTRL, approximately 800,000 can be downloaded immediately in PDF format without charge. Individuals will need to create their own free NTRL accounts at: https://ntrl.ntis.gov/NTRL/user/signUp.xhtml
Users can investigate patents and trademarks on the USPTO website. All patents from 1976 forward are available in text as well as image format in the patent search systems. All trademark images are accompanied by descriptions and design search codes which indicate types of images included in a mark on the trademark search systems. Pre-1976 patents are available in image format only. The website organizes its resources by topic and by audience to help users investigations.