...Systematic introduction on a considerable scaleprobably commenced in the forties, although with great secrecy...
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
...In the forties the check dams fellinto disrepair...
Henry S. Fitch 「The Forest Habitat of the University of Kansas Natural History Reservation」
...In the forties, when the woodrat was common on the area, its localdistribution seemed to be determined mainly by the osage orange...
Henry S. Fitch 「The Forest Habitat of the University of Kansas Natural History Reservation」
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