Users are cautioned that bibliographic information for records displaying Not Verified in the Verification Status field may need to be authenticated. Selection of key words for bibliographic entries was subjective but followed certain basic principles. We tried to indicate at least the general and specific subjects of each reference. Please note that this is the date on which data base files were updated and does not imply that the bibliography is current to this date with respect to included literature. Presently, the data base provides relatively complete coverage through 1999 of over 150 periodical sources.
Literature published in the current year is added as soon as it is discovered.
Users are encouraged to contribute to the data base by bringing new publications or works that may have been overlooked to the attention of Demarest or Reinecke.