Pamphlet on the evolution of the art of fortification. 
Prepared under the personal direction of Major General William M. Black, chief of engineers, U.S. army. 1919. 
 - Washington,  Govt. print. off.,  1919. 
 - 107 p.  XXVIII pl. (incl. fold. map) plans (1 fold.) diagrs.  23 cm. 
 - Occasional papers, Engineer school, U.S. army,  no. 58 .
<br/><br/><label>LCCN: </label>es 20000001  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Fortification.
<br/><br/><label>LC Class. No.: </label>UG1  / .U5 no. 58