Halverson, Galen P. Supplemental material: Toward a Neoproterozoic composite carbon-isotope record GSA Data Repository Item 2005146, GSA Bulletin, Vol. 117, p. 1181. File size: 52 p., about 386 KB. Geoscience 2005-01-01
    https://gsapubs.figshare.com/articles/journal_contribution/Supplemental_material_Toward_a_Neoproterozoic_composite_carbon-isotope_record/12338369
10.1130/2005146