Page 38 of NTIS Database Search Guide by National Technical Information Service

ntis subject categories alphabetical listing by major categories the ntis database search guide 38 47h-underwater construction habitats 85-transportation 850-general 85a-air transportation 85c-metropolitan rail transportation 85d-transportation safety 85e-pipeline transportation 85f-global navigation systems 85g-marine waterway transportation 85h-road transportation 85i-railroad transportation 79-ordnance 790-general 79a-ammunition explosives pyrotechnics 79b-armor 79c-bombs 79d-combat vehicles 79e-detonations explosion effects ballistics 79f-fire control bombing systems 79g-guns 79h-rockets 79i-underwater ordnance 91-urban regional technology development 910-general 91a-environmental management planning 91b-transportation traffic planning 91c-fire services law enforcement criminal justice 91d-communications 91e-housing 91f-health services 91g-urban administration planning 91h-regional administration planning 91i-emergency services planning 91j-economic studies 91k-social services 91l-recreation 82-photography recording devices 820-general 82a-holography 82b-photographic techniques equipment 82c-recording devices 46-physics 460-general 46a-acoustics 46b-fluid mechanics 46c-optics lasers 46d-solid state physics 46e-structural mechanics 46g-plasma physics 46h-radiofrequency waves 43-problem-solving information for state local governments 430-general 43a-finance 43b-economic community development 43c-human resources 43d-police fire emergency services 43e-energy 43f-environment 43g-transportation 84-space technology 840-general 84a-astronautics 84b-extraterrestial exploration 84c-manned spacecraft 84d-spacecraft trajectories flight mechanics 84e-space launch vehicles support equipment 84f-space safety 84g-unmanned spacecraft 38

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