[14] [5]: 373.

[15] [40]: 35.

[16] [30]: 228.

[17] [40]: chap, II. [D]: I, 17-110.

[18] For maps showing extent of ice at different glacial epochs, see [41]: vol. II, p. 419. [42]: end of volume.

[19] See Charts, [40]: 41-48. [5]. Also [40]: 45, 46; 412-427; 386.

[20] [40]: 95. [47].

[21] [D]: I, 380-412. [48].

[22] [40]: 130, 244.

[23] [D]: I, 113.