STATE:    state code

FIPS:     state and county code

TOT_ACRE: acres of land in a county (1992 National Resources
          Inventory data)

PRIV_LAND: acres of private land in a county (1992 NRI data)

PERC_PRIV: percent private land in a county (1992 NRI data)

PERC_URBCHANGE: percent urbran area changes from 1982 to 1992

PERC_CROPCHANGE: percent cropland area changes from 1982 to 1992

AIR_TIP:  sum of the product of the quantity (lbs/yr) of each
          1993 Toxic Releases Inventory (TRI) chemical released
          into air and TIP score in a county. TIP score is a
          numeric value assigned to a chemical based on its
          potential adverse human helath effects and its
          potential environmental effects. (EPA TRI data)

WATER_TIP:     sum of the product of the quantity (lbs/yr) of
               each 1993 TRI chemical released into water and TIP
               score in a county. (EPA TRI data)

URBAN_CO: county classed as urban 

PERC_URBAN92: percent urban area in a county (1992 NRI data)

SEWER_COST:    estimated construction cost for sewer system
               needed by 2012 (1992 EPA Needs Survery)

PERC_POPCHNG:  percent population changes from 1980 to 1990
               (Census data) 

POPDEN90: 1990 county population density (1990 Census data) 

S82R:     potential soil erosion rate (tons/acre/yr) from
          agricultural land (1982 NRI data)

S85R:     potential soil erosion rate (tons/acre/yr) from
          agricultural land (1987 NRI data)

S92R:     potential soil erosion rate (tons/acre/yr) from
          agricultural land  (1992 NRI data)

T&E_TOTAL:     total number of threatened and endangered species
               in a county (1992 F&W data)

PESTICIDE:     estimated 1987 pesticide usage (lbs/yr) in a
               county (Census Agriculture) 

NPDES:    number of wastewater dischargers in a county (EPA PCS data)

TRI: number of TRI facilities in a county (EPA TRI data)

RCRA_LQG: number of large quantity generators of hazardous wastes
          in a county (EPA RCRIS data)  

CERCLIS:  number of facilities having potential of releasing
          hazardous substances into the environment.  (EPA
          CERCLIS data)

ACRES_WETLOS: acres of wetland loss in a county (1992 NRI data)

WETLAND: acres of wetland in a county (1992 NRI data) 

AGR_LAND: acres of agricultural land in a county (1992 NRI data)

MAN_N87:  estimated 1987 nitrogen loading (kg/yr) from animal
          manure on agricultural land (1987 Census Agriculture)

FER_N85:  estimated 1985 nitrogen fertilizer (kg/yr) applied to 
          agricultural land (EPA data based on fertilizer sales)