If you subscribe without the digest option, and later change your mind and want to receive the digest, you have to unsubscribe from the list and then resubscribe. Each new table of contents, with links to respective abstracts, is sent automatically to you via e-mail as soon as it becomes available electronically. To subscribe, users select one or more journals from an alphabetical list or click on an area of interest. Once an email address is entered, subscribers receive a confirmation message. The 1997 edition of this handy reference work, produced by the US Central Intelligence Agency, is available.
Data can be time series or snapshot.
Note that the quality of figure images varies by image. The basic search interface supports title and document number queries. Information returned includes title, document number, whether or not there is an ANSI approved standard, and ordering information. The search help applies to an enhanced version of the search interface that is fee based. Knowledge Discovery Nuggets is both a web site and an associated newsletter.