See reference at http://www.filosofia.org/enc/eha/eha.htm*"El Nuevo Tesoro de la Juventud", published by Grolier in 20 volumes*"Enciclopedia Encarta"*"Enciclopedia universal ilustrada europeo-americana"; the biggest encyclopedia of its time.
See reference at http://www.filosofia.org/enc/eha/eha.htm* "El Nuevo Tesoro de la Juventud", опубликованная Grolier в 20 томах* "Enciclopedia Encarta"* "Enciclopedia universal ilustrada europeo-americana"; the biggest encyclopedia of its time.