REMOVE

1. trains (vehicle groupings)
2. fires (events)
3. wrecks (sites)

WHAT

1. Visual Works (hierarchy n … (1)
2. color film (film) (1)
3. cranes (equipment) (1)
4. farms (1)

More 

WHERE

1. Carroll County, Maryland (1)
2. New Windsor, Maryland (1)

WHO

1. Still, Patricia (1)

WHEN

1. 1968 (1)
2. 1968 Summer (1)