Note 14 — VOLUME VI slice I Châtelet to Chicago (continued 11)
Reading edition
It has been above 1,000,000,000 ft. since 1870, and has in some years risen to 2,000,000,000.
Reading edition
It has been above 1,000,000,000 ft. since 1870, and has in some years risen to 2,000,000,000.