REMOVE

1. forests (plant communities)
2. snow (precipitation)
3. 1964

WHAT

1. Visual Works (hierarchy n … (2)
2. clouds (2)
3. farms (2)
4. fields (land) (2)

More 

WHERE

1. Westminster, Maryland (2)

WHO

1. Campbell, Sandra L. Still (1)
2. Sandra L. Still Campbell; … (1)

WHEN

1. 1963 (1)
2. 1963 - 1964 (1)