: An English version titled Essentials of Modern Physics is available for borrowing or digital streaming.

If you are a Physics or Engineering student in a Spanish-speaking university (UNAM, UNI, UPC, etc.), you know the name: Curso de Física Moderna by Acosta, López, and Moreno. It is the standard bridge between classical physics and the quantum world.

If the solucionario for Acosta is too elusive, these books offer equivalent problems with fully worked solutions (and no “320 error”):

Solucionario Curso de Física Moderna: Virgilio Acosta (320 Fixed) Curso de Física Moderna