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• | NAP - THE NATIONAL ACADEMIES PRESS |
• | NARCIS |
• | NATIONAL BIODIESEL BOARD |
• | NATIONAL SAFETY COUNCIL |
• | NATOTERM |
• | NBN - BUREAU VOOR NORMALISATIE/BUREAU DE NORMALISATION (BELGICA) |
• | NCBI - NATIONAL CENTER FOR BIOTECHNOLOGY INFORMATION |
• | NEMA - NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (ESTADOS UNIDOS) |
• | NEN - NEDERLANDS NORMALISATIE-INSTITUUT (PAISES BAJOS) |
• | NEW YORK PUBLIC LIBRARY |
• | NFPA - NATIONAL FIRE PROTECTION ASSOCIATION (ESTADOS UNIDOS) |
• | NIOSH - NATIONAL INSTITUTE FOR OCCUPATIONAL SAFETY AND HEALTH (ESTADOS UNIDOS) |
• | NISO - NATIONAL INFORMATION STANDARDS ORGANIZATION (ESTADOS UNIDOS) |
• | NIST - NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY |
• | NIST - PHYSICAL REFERENCE DATA |
• | NIST CERAMICS WEBBOOK |
• | NIST CHEMISTRY WEBBOOK |
• | NIST DATA GATEWAY |
• | NIST DIGITAL LIBRARY OF MATHEMATICAL FUNCTIONS |
• | NIST HEAT TRANSMISSION PROPERTIES OF INSULATING AND BUILDING MATERIALS |
• | NIST PERIODIC TABLE OF THE ELEMENTS |
• | NIST REFERENCE ON CONSTANTS, UNITS AND UNCERTAINTY |
• | NIST SP 330. THE INTERNATIONAL SYSTEM OF UNITS (SI) 2019 EDITION |
• | NOBELPRIZE.ORG |
• | NORMATIVA LEGAL - GOBIERNO DE LA CIUDAD DE BUENOS AIRES |
• | NSAI - NATIONAL STANDARDS AUTHORITY OF IRELAND (IRLANDA) |
• | NSF - NORWEGIAN STANDARDS ASSOCIATION (NORUEGA) |
• | NSO - NATO STANDARDIZATION OFFICE (OTAN) |
• | NUEVO PARHADIGMA |
• | NUTRINFO |
• | NZS - SNZ STANDARDS NEW ZEALAND (NUEVA ZELANDA) |
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N | O | P | Q | R | S | T | U | V | W | X | Y | Z |