Using Subject Heading For Online Retrieval Is An Indispensable Tool For Online System Designers Who Are Developing New System Or Refining Existing Ones. The Book Describes Subject Analysis And Subject Searching in Online Catalogs, Including The Limitations Of Retrieval, And Demonstrates How Such Limitation Can Be Overcone Through System Design And Programming. The Book Describes The Library Of Congress Subject Headings System And System Characteristics, Shows How Information is Stored in Machine-Readable Files, And Offers Examples Of And Recommendations For Successful Retrieval Methods