Newton (1987), who did a survey of sinkhole formation in the eastern United States, regards suffusion as the cause of most sinkholes.
(Newton (1987; regards; suffusion; as the cause of most sinkholes) Context(Newton ( 1987 regards,List([0, 91))):(Newton (1987; regards suffusion did; a survey of sinkhole formation in the eastern United States)
Newton ( 1987 regards,List([0, 91))
Newton (1987 Newton (1987
regards regards suffusion did
suffusion as the cause of most sinkholes
a survey of sinkhole formation in the eastern United States