My memory of "very hard to find" meant that 15 years ago the campus bookstore didn't carry it.
I'd still bet that badly-photocopied sheets of ternpaper are being handed out on a daily basis in Petrology classrooms around the globe, though :)
http://incompetech.com/graphpaper/trianglehex.html
Adjust line parameters as you like, and it gives you a PDF.
I used it to get a hex grid when explaining Pascal's triangle to my kid.
My memory of "very hard to find" meant that 15 years ago the campus bookstore didn't carry it.
I'd still bet that badly-photocopied sheets of ternpaper are being handed out on a daily basis in Petrology classrooms around the globe, though :)