TITLE: What reference contains the proof of the classification of the wallpaper groups?
QUESTION [5 upvotes]: Background: I am doing a course on Groups and Geometry ( Open University M336 ). One of the topics is the classification of the plane symmetries, a.k.a. The Wallpaper Groups.
Question: What reference contains the original proof that there exists only 17 wallpaper groups?

REPLY [2 votes]: Try "The 17 Plane Symmetry Groups" by R.L.E. Schwarzenberger, The Mathematical Gazette Vol 58 No 404.