http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
The book provides basic principles and the unity of physics. First, it emphasizes that the first part of developing any theory is to make a model of the physical situation and state its assumptions. Then the book shows how later observations serve to refine the model and improve the overall understanding. Examples discussed include such fundamental models as the kinetic theory of gases, the free electron model of metals, the wave model of particles, and the quark model of matter