They are usually used very early in a search or as an aid to formulating a search. They let you know what sources are out there, what information the sources contain, and how the sources are indexed. Guides are available in many subject areas. Though somewhat dated, still valuable for the text on how to formulate a search strategy and the general information on how to locate information. A directory of worldwide, English-language reference sources.
Main index is by subject, but an author-title index is also included.
Provides general information about patents both in the US and abroad including techniques for locating them. Also discusses online searching techniques. A guide to worldwide sources of information on polymers and plastics. This book provides general descriptions of types of sources, discussions of sources for specific types of materials, and discussions of sources by geographic region. A listing of sources for various scientific disciplines.