Porter SC.  1964.  Composite Pleistocene Snow Line of Olympic Mountains and Cascade Range. Geologic Society of America Bulletin. 75:477-481.

Porter SC, Denton GH.  1967.  Chronology of Neoglaciation in the North American Cordillera. American Journal of Science. 265:177-210.

Porter SC, Pierce KL, Hamilton TD.  1983.  Late Wisconsin Mountain Glaciation in the Western United States. Late-Quaternary environments of the United States. 1:71-111.