A professional who manages library or section containing specialized materials for industrial, commercial, or governmental organizations, or for such institutions as schools and hospitals. Responsibilities include:

• Selects, orders, catalogs, and classifies special collections of technical books, manufacturers' catalogs and specifications, periodicals, magazines, newspapers, audio-visual material, microforms, journal reprints, and other materials.
• Searches literature, compiles accession lists, and annotates or abstracts materials.
• Assists patrons in research problems.
• May key information into computer to store or search for selected material.
• May translate or order translation of materials from foreign languages into English.
• May train other workers engaged in cataloguing, locating, filing, or copying selected material.
• May be designated according to subject matter, specialty or library, or department as Art Librarian; Business Librarian; Engineering Librarian; Law Librarian; Map Librarian; Medical Librarian.