Dataset:  tombstone.dat

Source: T.C.Meierding(1993)."Marble Tombstone Weathering and Air Pollution 
in North America", Annals of the Association of American Geographers,
Vol.83,#4pp.568-588

Description: Marble Tombstone Mean Surface Recession Rates and Mean SO2
concentrations over a 100 year period. Note: Data are interpolated from
a graph and regression coefficients differ from authors results by a
small amount.

Variables/Columns

City 1-24
Modelled 100-Year Mean SO2 Concentration (ug/m**3)  27-29
Marble Tombstone Mean Surface Recession Rate (mm/100years)  34-37