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Fortification - Wikipedia
Fortification Definition & Meaning - Merriam-Webster
Food fortification - World Health Organization (WHO)
Fortification | Military Science & History of Defense Structures
FORTIFICATION | English meaning - Cambridge Dictionary
fortification summary | Britannica
FORTIFICATION definition | Cambridge English Dictionary
The Fortification System - U.S. National Park Service
Fortification Definition & Meaning | Britannica Dictionary
Fortification - Simple English Wikipedia, the free encyclopedia