Home › Authors › William D. Ennis 👤 William D. Ennis b. 1877 ยท 5 books Books by William D. Ennis Motor vehicle taxation in New Motor vehicle taxation in New Jersey 1935 Vapors for heat engines, including considerations relating to the use of fluids other than steam for power generation 1912 Works management 1911 Applied thermodynamics for engineers 1910 Formulas and constants for gas engine design ... 1910