Forts of the Upper Missouri by Athearn, Robert G.

A history of fortification from 3000 BC to AD 1700 by Toy, Sidney

Strategic hamlets in South Viet-Nam a survey and a comparison by Osborne, Milton E.

Strategic hamlets in South Vietnam a survey and a comparison by Osborne, Milton E.

Strategic hamlets in South Viet-Nam a survey and a comparison by Osborne, Milton E.

The fortified cities of India by Toy, Sidney

Annual report of Major General George W. Davis, United States army ; commanding Division of the Philippines. From October 1, 1902 to July 26, 1903.

Report in which, by order of his catholic majesty (may God protect him), the strongholds, castles, forts and garrisons of the provinces under his royal dominion in the Philippine I...

China militarizes South China Sea

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Fortification of rice-based kroepeck using powdered malunggay (Moringa oleifera) leaves by Arguez, Luren Grace Sogo-an