The Avalanche Handbook, by David McClung and Peter Schaerer
The Physics of Skiing, D. Lind and S. P. Sanders.
The Handbook of Snow, D. N. Gray and D. H. Male, Pergamon Press. Out-of-print; excellent.
The Avalanche Book, by Betsy Armstrong and Know Williams.
Glaciers of North America, by Sue A. Ferguson.
IN PRAISE OF SNOW
In Praise of Snow Atlantic Monthly, January 1995 lead article
by Cullen Murphy is a nice history of snow research in the western
United States.
Nice bibliography on technical aspects of avalanches:
Cyberspace Snow and Avalanche Bibliography
Nice bibliography on snow related books put together
by the National Snow and Ice Data Center:
Books on Snow, NSIDC
Educational material on snow, emphasizing storms and blizzards,
by the National Snow and Ice Data Center:
Snow storms and blizzards, NSIDC
BENTLEY AND HUMPREYS: SNOW CRYSTALS
Here's a link to the sellar of Bentley and Humpreys
classic book:
SNOW CRYSALS