Natural Resources Research
Natural Resources Research > 1999 > 8 > 3 > 177-192
Natural Resources Research > 1999 > 8 > 3 > 233-250
Natural Resources Research > 1999 > 8 > 3 > 193-203
Natural Resources Research > 1999 > 8 > 3 > 205-217
Natural Resources Research > 1999 > 8 > 3 > 219-232