http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Book 1. Fundamental fluid laws.--Book 2. Fluid conditioning and auxiliary devices.--Book 3. Hydraulic input devices - pumps.--Book 4. Fluid power input and output devices.--Book 5. Energy modulation and control devices.
[by] John Nagohosian, William D. Wolansky [and] Andrew A. Mazzara.