While many databases are focused on similar subjects, each database is unique. Differences may result from types of publications covered, data included, indexing standards, the presence of a thesaurus, or special formatting options. Details of each database are documented in its Bluesheet. A Dialog Bluesheet contains a description of the database content, provider contact information, terms of use, specific data available for searching, tagging, output formats, and other important features specific to the database. Bluesheets are available in PDF format online at , or as searchable text online in Dialog File 415. .
