I have no links, but I can tell you what I heard from my grandfather. Basically, yes, they took guns to school. Everyone did. It wasn't considered abnormal at all. They never had any problems with school shootings either. I guess if everyone has a gun, you'd end up dead pretty fast if you tried to start anything. After school, they'd go hunting and try to shoot something for dinner that night. If they couldn't get anything, their family might go without dinner that night.

I believe he lived in a fairly rural area though. I assume things were different in the cities.