Dear Markus,
the International Atomic Energy Agency distributes reference and 
intercomparison materials for stable isotopes of light elements (2H, 13C, 
15N, 18O, 34S). Among the available 34S materials is one intercomparison 
material (IAEA-S-3, silversulfide) with a delta34S value around -32 permille 
V-CDT.
For further details send a e-mail to me:
[log in to unmask]
A catalogue is available with all  intercomparison and reference materials 
distributed by the IAEA. The new 1996 catalogue will be available in 
April/Mai including new materials and several
changes in distribution policy. For ordering catalogues please send e-mail 
to me or (preferably)
letter/e-mail to:
    International Atomic Energy Agency
    Analytical Quality Control Services
    Agency's Laboratories Seibersdorf
    P.O.Box 100
    A-1400 Vienna (AUSTRIA)
e-mail:   [log in to unmask]

Best regards
                          Manfred Groening
                          Isotope Hydrology Section
                          IAEA
 ----------
From: isogeochem
To: isogeochem
Subject: Sulphur refs.
Date: Thursday, March 07, 1996 1:14PM

Dear All
Can someone tell me where I could find a sulphur references with cdt values
of about -21 and -35. Many thanks for your help.
Best regards
Markus