The article is based on the several sketch maps of the Spanish fortifications at Isabela, Siasi and Bongao drawn in 1899 by an American army officer named H. M. Reeve.
Info
| Type of Material | Unpublished |
| Research Publication Address | Manila: NCCA |
| Year Published | 2001 |
| Author | SPOEHR, Alexandra , 2001. |
| Research Location | Mindanawon, Ateneo de Davao University, Davao City MWN |