Columbia subject headings:
Columbine High School (Littleton, Colo.)
Documentary films.
Feature films.
Films for the hearing impaired.
Gun control--United States.
School shootings--Investigation--Colorado--Littleton.
School violence--Colorado--Littleton.
Harvard subject headings:
Columbine High School (Littleton, Colo.)
Documentary films
Gun control--United States
School shootings--Investigation--Colorado--Littleton.
School violence--Colorado--Littleton.
Princeton subject headings: