Dear all,

We have been informed by IAEA that the USGS40 (L-glutamic acid) isotopic reference material is out of stock from their supply. USGS40 and several other isotopic reference materials are now available from the U.S. Geological Survey. For ordering instructions, please see


Haiping Qi

MS 431
U.S. Geological Survey
12201 Sunrise Valley Dr.
Reston, VA 20192

Office: 703-648-6338
Lab:     703-648-5859 (5871)
Fax:     703-648-5832
email: [log in to unmask]