62 Engineering
623 Military and nautical engineering
623.0155 Military geophysics 623.04 Special topics of military engineering 623.092 Military engineers 623.1 Fortifications 623.2 Mine laying and clearance, demolition 623.3 Engineering of defense 623.4 Ordnance 623.5 Ballistics and gunnery 623.6 Military transportation technology 623.7 Communications, vehicles, sanitation, related topics 623.8 Nautical engineering and seamanship
Dewey Decimal Classification
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