Dynamics of Ice Crystal Growth," by Kenneth G. Libbrecht, Annual
Reviews of Materials Research, 2017. 47:271–95.
This is a detailed review paper describing much of what is currently
known about how ice crystals grow. It's a dense read, with much
information relegated to the references.
"The Snowflake: Winter's Frozen Artistry," by Kenneth
Libbrecht and Rachel Wing, 2015, Voyageur Press.
This is a popular-science book, describing snowflake science in a more
readable format, but with much less scientific detail.