Samuel Marolois
... that Samuel Marolois wrote books about theory and practice of both perspective and fortification?
... that <b id="mwBpU"><a href="./Samuel_Marolois" id="mwBpY" rel="mw:WikiLink" title="Samuel Marolois">Samuel Marolois</a></b> wrote books about theory and practice of both <a href="./Perspective_(graphical)" id="mwBpc" rel="mw:WikiLink" title="Perspective (graphical)">perspective</a> and <a href="./Fortification" id="mwBpg" rel="mw:WikiLink" title="Fortification">fortification</a>?