National Geographic
June, 1981, pp. 714-776

The Roman Engineers
L.A. & J.A. Haley
Cambridge University Press, 1981, pp. 19-23

The New York Times
Article, The Appian Way (Date unknown)

The Mutes Stones Speak
Paul MacKendrick
St. Martin's Press, N.Y. 1960

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Chorobates and Groma illustrations by Mike Ginter

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