REMOVE

1. bridges (built works)
2. farms
3. Carroll County, Maryland

WHAT

1. Chevrolet Corvair automob … (1)
2. Visual Works (hierarchy n … (1)
3. automobiles (1)
4. barns (1)

More 

WHERE

1. Maryland Route 407 (state … (1)
2. Sam's Creek Road, Carroll … (1)
3. Westminster, Maryland (1)

WHO

1. Still, Clyfford (1)
2. Still, Patricia (1)

WHEN

1. 1970 (1)
2. circa 1970 August (1)