They supercede the printed indexes of the same names. Historical Abstracts has been published since 1954 and America History and Life has been published since 1964. Searches can be limited to either refereed journals or to full text journals or both. Searches can also be limited to particular periodicals. Ref D521 E5.
Bibliographies accompany the short articles.
This is the largest book catalog in existence, even larger than the Library of Congress. It is also easier to access. Located in D731-838. . Air University Library Index to Military Periodicals. For older information use the printed indexes.