1 "Ficheiro:Military_preparedness_and_the_engineer_(IA_militaryprepared00robirich).pdf".

Ficheiro:Military preparedness and the engineer (IA militaryprepared00robirich).pdf

PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Military_preparedness_and_the_engineer_(IA_militaryprepared00robirich).pdf...