A later survey in 1957 identified 151 people infected with leprosy.
The later survey used the boundary with Indiana as the meridian.
By comparison with later surveys the classification employed relatively few categories.
However, a later survey found that Mount Adam was higher.
But a later survey of local hospitals turned up no survivors.
Thus, the later survey probably picked up some people who otherwise would not have been counted as working until July.
In fact, a later survey was carried out in 1970.
A later survey found that more than half the public ignored it.
His early work surveying the city of Edinburgh became a model for later surveys.
A later survey was performed by Barry Taylor in 2005.