Breves apuntes sobre algunos objetos prehistóricos de la provincia de Santander

Privately printed pamphlet asserting the prehistoric origin of cave paintings discovered in the cave of Altamira, Cantabria, Spain by Maria Sanz de Sautuola, daughter of the author. These were first prehistoric cave paintings discovered; initially the scientific establishment refused to accept the prehistoric origin of these paintings, and other cave paintings as they were discovered.