Snowflake study through photomicrography, 1890.
Historical Figures: Wilson Bentley, The Man Who Photographed Snowflakes – Just History Posts
How do you photograph a single snowflake?
Bentley Snow Crystals Smithsonian Institution
Only at RIT – Confessions of a Snowflake Photographer – School of Photographic Arts and Sciences Blog
Snowflake Study Smithsonian Institution
Who Ever Said No Two Snowflakes Were Alike? - The New York Times
No two alike
Snowflake Science — STEMSpark LLC
599 Snowflake Images: PICRYL - Public Domain Media Search Engine Public Domain Search
Snowflake Study (5243830768) - Early photography, Public domain image - PICRYL - Public Domain Media Search Engine Public Domain Search