[D] The last United States census puts our coal lands at something more than 225,000 square miles.
[E] "This deposit occurs as far north as the southern shores of Lake Ontario, and thence extends in an almost continuous manner through Pennsylvania, Virginia, Kentucky, and Tennessee to central Alabama."—N. S. Shaler's The United States of America, vol. i, p. 432.
[F] If we accept the reclaimable area given above as approximately correct, and apply a system of irrigation, it can be cultivated, "and made the happy home of an industrious people more than equaling in number the inhabitants of the United Kingdom of Great Britain and Ireland."—J. N. Irwin, in Forum, vol. i, p. 742.
[G] Forum, vol. xii, p. 750.
[H] Report of the Secretary of the Interior, 1891.
[I] The United States of America, vol. i, p. 382.
[J] United States Report on Commerce and Navigation for 1897.
[K] Ibid.
[L] W. Allyne Ireland, in an address before the University of Pennsylvania.
[M] See Coffee and India-Rubber Culture in Mexico. By Matias Romero, late Mexican minister to the United States.