Book Subjects

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•	Human ecology -- History (79)
•	Ecology -- History (22)
•	Ecology -- Philosophy -- History (7)
•	Human ecology -- Tanzania -- History (6)
•	Ecology -- Africa, East -- History (5)
•	Ecology -- Europe -- Colonies -- History (5)
•	Human ecology -- Religious aspects -- Protestant churches -- History of doctrines -- 20th century (5)
•	Ecology -- Tanzania -- History (5)
•	Agricultural ecology -- High Plains (U.S.) -- History (5)
•	Human ecology -- History -- 20th century (5)
•	Human ecology -- Kansas -- History -- 19th century (4)
•	Rain forest ecology -- Sri Lanka -- History -- 19th century (4)
•	Garden ecology -- England -- Weald of Kent -- History (4)
•	Human ecology -- Philosophy -- History (3)
•	Human ecology -- Great Plains -- History (3)
•	Forest ecology -- Government policy -- United States -- History (3)
•	Human ecology -- Rome -- History (3)
•	Prairie ecology -- Kansas -- History -- 19th century (3)
•	Human ecology -- Religious aspects -- Christianity -- History of doctrines -- 20th century (3)
•	Human ecology -- Great Plains -- History -- 19th century (3)

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