Carole A. Barbato & Laura L. Davis 
This We Know [PDF ebook] 

The events that led up to and include the shootings of May 4, 1970 are part of a story that continues to be written. This We Know succinctly documents the facts that fill out the chronology of events of the four fateful days that ended with members of the Ohio National Guard wounding nine Kent State students and killing Sandra Scheuer, Jeffrey Miller, Allison Krause, and William Schroeder. This We Know gathers well-established information from recorded accounts-from the time they happened through what has been learned since.