Encyclopaedia Britannica, 11th Edition, "Châtelet" to "Chicago", Volume 6, Slice 1Note 7 — VOLUME VI slice I Châtelet to Chicago (continued 11)Reading editionTotal excavation, 42,397,904 cub. yds.; of solid rock, 12,265,000.◇Copy noteReturn to VOLUME VI slice I Châtelet to Chicago (continued 11)