@izzythepush,
Sorry a simple google search my lazy friend with the terms "largest killing of school children in US history" will get your links.
The death toll by Wikipedia happen to be 38 children, 6 adults and 58 people injury.
Once more who need firearms to kill as there are proven far "better" means to do mass murders.
As far as it being 1927 so what as guns was roughly at the same state of the art then as now, with the Thompson submachine guns and the BARs being available for sale to the general public unlike now.
In a sad way repeat in a sad way, we are lucky most mass and would be mass murderers picked firearms to do their killings instead of the more deadly and simple to made bombs.
Oh there is no reason to think if guns was not available that the proven more deadly means of killings large number of people would not be turn to.