S.L. Clemens saw "A Panorama of Australia, China, and the Japanese Expedition" by Edward Boneau in St. Louis; he praised it in the Muscatine _Journal_, 24-26 Feb 1855 (_Mark Twain's Letters, vol. 1, 1853-1866_, 50-51, 53n7. Leon Pomarede's "Panorama of the Mississippi River and Indian Life," said to be 1800 yards long, was shown in St. Louis in 1849, and John Banvard's "Panorama of the Mississippi," said to be 3 miles long, was exhibited in 1846. I don't know if Clemens saw either one, though. At least one panorama still survives: the pictorial record of a year-long whaling voyage, two panels of which (ca. 20' long x 7' high) are on display at the Old Dartmouth Historical Society (aka the New Bedford Whaling Museum). It's worth a visit. At one time, it was on temporary display running around the walls of a large vacant supermarket, but rolling and unrolling it to show it as originally intended would damage it, and no one can afford a space large enough to show it all at once. A film of it was contemplated. Don't know if it was ever made. Kenneth M. Sanderson Mark Twain Papers