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The ''Energy Citations Database (ECD)'' was created in 2001 in order to make scientific literature citations, and electronic documents, publicly accessible from U.S. Department of Energy (DOE), and its predecessor agencies, at no cost to the user. This database also contains all the unclassified materials from Energy Research Abstracts. Classified materials are not available to the public. ''ECD'' does include the unclassified, unlimited distribution scientific and technical reports from the Department of Energy and its predecessor agencies, the Atomic Energy Commission and the Energy Research and Development Administration. The database is usually updated twice per week.〔〔 ''ECD'' provides free access to over 2.6 million science research citations with continued growth through regular updates. There are over 221,000 electronic documents, primarily from 1943 forward, available via the database. Citations and documents are made publicly available by the Regional Federal Depository Libraries. These institutions maintain and make available DOE research literature, providing access to non‑electronic documents prior to 1994, and electronic access to more recent documents.〔〔 ''ECD'' was created and developed by DOE's Office of Scientific and Technical Information with the science-attentive citizen in mind. It contains energy and energy‑related scientific and technical information collected by the DOE and its predecessor agencies.〔〔 〕 ==Scope== Topics, or subjects, and Department of Energy disciplines of interest in ''Energy Citations Database'' (ECD) are wide-ranging. Scientific and technical research encompass chemistry, physics, materials, environmental science, geology, engineering, mathematics, climatology, oceanography, computer science, and related disciplines. It includes bibliographic citations to report scientific literature, conference papers, journal articles, books, dissertations, and patents. 〔 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Energy Citations Database」の詳細全文を読む スポンサード リンク
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