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An online guide to snowflakes, snow crystals, and other ice phenomena:

The official website of Wilson A. Bentley:

SnowSTAR 2007 Barrenlands Traverse:

The Western Snow Conference:

The Eastern Snow Conference:

National Snow & Ice Data Center, All about snow:

Natural Resources Conservation Service, US Dept of Agriculture: SNOTEL Data & Products:

USDA Agricultural Research Service, Anatomy of a Snowflake:

USDA Beltsville Agricultural Research Center, Electron Microscopy Unit Snow Page:

USDA Beltsville Agricultural Research Center, Can You Image a Snowflake with an SEM? Certainly!:

All photographs copyright M. Sturm unless otherwise noted.