Isotope masses and abundances
Isotopes: weights and abundances
Isotope abundances from mass spectra
TABLES OF ISOTOPIC ABUNDANCES
Natural Abundance of Chlorine Isotopes
Atomic Masses and Isotope Abundances
Isotopic Abundance in Natural Iron
The Effect of Mass Discrimination on Isotope Abundance Measurements. Relative Abundances of Krypton Isotopes
Lithium isotopic abundances in stars