Einstein's Mass-Energy Equation, Volume I: Early History and Philosophical FoundationsEinstein's Mass-Energy Equation, Volume I: Early History and Philosophical Foundations.Fernflores Francisco 116 pp. Momentum Press, New York, 2018. $49.95 (paper). ISBN 978-1-60650-857-2.Einstein's Mass-Energy Equation, Volume II: Quantum Mechanics and Gravitation, Empirical Tests, and Philosophical Debates.Fernflores Francisco 93 pp. Momentum Press, New York, 2018. Price: $49.95 (paper). ISBN 978-1-94664-674-3