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].