Bases de datos, diccionarios, catálogos y manuales en línea
- MatWeb, Your Source for Materials Information
- On-line Catalogue of European Standards
- NIST Guide for the Use of the International System of Units (SI)
- Libro del Web de Química del NIST
- NIST scientific and technical databases
- NIST/SEMATECH e-Handbook of Statistical Methods
- Fundamental Physical Constants from NIST
- NIST Engineering Metrology Toolbox
- Diccionario de la Lengua Española, RAE
- The International Association for the Properties of Water and Steam
- The Matrix Cookbook
- Crystallography Open Database
- Database of Raman spectra, X-ray diffraction and chemistry data for minerals
- Committee on Data for Science and Technology (CODATA)
- NIST ITS-90 Thermocouple Database
- COMAR, the international database for certified reference materials
- IAEA Database of Natural Matrix Reference Materials
- Métrologie-AFNOR
- Wiley Analytical Science website on Wiley InterScience
- CEESI Flow Measurement Technical Library
- Base de Datos Proteínas
