rate of recession of, [356].
Niches, [371];
beneath snowdrift sites, [368], [369].
Nickel, in meteorites, [23].
Nieves penitentes, [397].
Nipissing Great Lakes, [335], [342].
Nipissing outlet, [335], [336].
Nippur, sand mounds over, [218].
Nivation, [368].
Nivation glacier, [387].