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Books about Koepfli:
Journey to New Switzerland: Travel Account of the Koepfli and Suppiger Family to St. Louis on the Mississippi... by Professor Emeritus John C. Abbott Ph.D. and Professor Emeritus Raymond J. Spahn Ph.D. (Nov 1, 1986)
Reisebericht Der Familie Köpfli & Suppiger Nach St. Louis Am Mississippi Und Gründung Von New-switzerland, Im... by Suppiger Joseph], Köpfli Kaspar and Köpfli Salomon (Sep 29, 2010)
REISEBERICHT DER FAMILIE KÖPFLI UND SUPPIGER (German Edition) by Josef Suppiger and Salomon Köpfli (Dec 31, 1973)
Koepfli: A partial history of the family by Joseph Blake KoÌpfli (1981)
Interview with Joseph B. Koepfli (California Institute of Technology Oral History Project) by Joseph Blake Koepfli (1984)