Natural Resources Research
Natural Resources Research > 1999 > 8 > 2 > 123-135
Natural Resources Research > 1999 > 8 > 2 > 111-122
Natural Resources Research > 1999 > 8 > 2 > 153-163
Natural Resources Research > 1999 > 8 > 2 > 165-173
Natural Resources Research > 1999 > 8 > 2 > 137-152
Natural Resources Research > 1999 > 8 > 2 > 93-109