http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
5 volumes : illustrations, diagrams ; 23 1/2 cm.
I. Mechanics, engineering, heat.--II. Electricity.--III. Meteorology, metrology, and measuring apparatus.--IV. Light, sound, radiology.--V. Aeronautics, metallurgy. General index.