(See Schedule and Reading List for detailed and exhaustive notes on Stable Isotope Geochemistry)
it's a pretty broad field of general geochemistry (see?)
A Brief Early
History of Stable Isotope Geochemistry
Jordi Delgado's ISOFRAC program -- to calculate 1000lna
(Note: you need Excel to
open this file)
Another site with some useful isotope programs
(@ Goettingen)