McDowell, Fred W. Supplemental material: K-Ar and U-Pb Zircon Chronology of Late Cretaceous and Tertiary Magmatism in Central Chihuahua State, Mexico GSA Data Repository Item 9403, GSA Bulletin, Vol. 106, p. 118. File size: 8 p., about 165 K bytes. Geoscience 1994-01-01
    https://gsapubs.figshare.com/articles/journal_contribution/Supplemental_material_K-Ar_and_U-Pb_Zircon_Chronology_of_Late_Cretaceous_and_Tertiary_Magmatism_in_Central_Chihuahua_State_Mexico/12334367
10.1130/9403