The Foundations of Science / Henri Poincaré. [Transl. George Bruce Halsted]. - 1913
1913 collected edition, transl. by George Bruce Halsted
La Valeur de la Science / Henri Poincaré
La Science et l'Hypothèse / Henri Poincaré
The foundations of science; Science and hypothesis, The value of science, Science and method (IA cu31924012063537).pdf