European Commission Joint Research Center
Certified reference materials for applications in the fields of food and feed analysis, environmental analysis, engineering and health.

National Institute of Standards and Technology
A searchable reference standard database where keywords can be entered. NIST produces a wide variety of both geology, environmental and industrial standards.

United States Geological Survey
The USGS produces many standards for a variety of geological matrices. USGS standards can be purchased in mounts that fit nicely inside the CETAC sample cell.

Natural Resources Canada
NRC produces reference materials principally for analytical laboratories in the mineral, metallurgical, earth science, and environmental industries.

SPI supplies
SPI produces many types of reference standards for various analytical techniques. SPI can also produce custom standards.

GeoReM
An excellent source for reference data for various standards.