"Sections of the aqueduct, showing its construction. I. Embankments across valleys.—II.Masonry in earth excavations.—III. Tunnel cutting in earth.—IV. Tunnel cutting in rock.—V.Open cutting in rock."
unidentified illustrator of an article by T. Addison Richards
1860-12
T. Addison Richards, "The Croton Aqueduct", <i>Harper's</i> magazine, No. CXXVII - December 1860 - Vol. XXII, p. 22. Scanned at 300 dpi.