Mackenna, B. V., his books, [xiii].

Maclean, J. P., on Atlantis, [45];

Mastodon, Mammoth and Man, [388];

Moundbuilders, [401];

on the serpent mound, [401];

on the Grave Creek tablet, [404];

mounds in Butler County, [408].

Maclovius, Bishop of Aleth, [48].

Macomb, J. N., Exploring Exped. from Santa Fé, [440].