From Barnes' Language Lessons or Short Studies in English, 1887.

From Introduction to Physical Science by Alfred Gage, 1894.

From The Snow Book by Western Education Development Group, 1978.

From Water Wonders Every Child Should Know: Little Studies of Dew, Frost, Snow, Ice and Rain by Jean M. Thompson, 1907.

From The Werner Primer for Beginners in Reading by F. Lilian Taylor, 1895.

"Germ or birth of ice crystal."  From Water Wonders Every Child Should Know: Little Studies of Dew, Frost, Snow, Ice and Rain by Jean M. Thompson, 1907.

From Wee Wisdom, 1908.

From Water Wonders Every Child Should Know: Little Studies of Dew, Frost, Snow, Ice and Rain by Jean M. Thompson, 1907.

From Mother Nature's Children by Allen Walton Gould, 1900.

From The Secret of the Himalayas by Hal Evarts, 1962.

From The Ontario Second Reader, 1880.

From Exploring the World of Science by Charles Lake, 1939. 

From Our Environment, How We Adapt Ourselves to It by Carpenter and Wood, 1937.

A snowflake invaded by germ crystals.  From Water Wonders Every Child Should Know: Little Studies of Dew, Frost, Snow, Ice and Rain by Jean M. Thompson, 1907.

From Water Wonders Every Child Should Know: Little Studies of Dew, Frost, Snow, Ice and Rain by Jean M. Thompson, 1907.

From Surprises by Patch & Howe and illustrated by Eleanor Eadie, 1935.

The Masonic and Egyptian snowflakes.  From Water Wonders Every Child Should Know: Little Studies of Dew, Frost, Snow, Ice and Rain by Jean M. Thompson, 1907.

Triangular snow.  From Water Wonders Every Child Should Know: Little Studies of Dew, Frost, Snow, Ice and Rain by Jean M. Thompson, 1907.

From Snowflakes by Israel Perkins Warren, 1863.

Freak snowstorms are comprised of freak crystals (bottom right).  From Water Wonders Every Child Should Know: Little Studies of Dew, Frost, Snow, Ice and Rain by Jean M. Thompson, 1907.