Arêtes, [373].
Arldt, Theodore, cited, [11], [19], [438].
Arnold, Ralph, cited, [157].
Arrangement of oceans and continents, [10].
Artesian wells, [190], [191], [196].
Ash, volcanic, [122].
Askja, eruption of, in 1875, [101].
Assmann, R., cited, [294].
Astronomical vs. geodetic observations, [12].
Atlantis, North, [16].