1. Spring tide returning;Post;Rachel Carson Council News,1998
2. Against the grain: biotechnology and the corporate takeover of your food.;Lappe,1998
3. Redefining sludge. The Workbook 1998; 23: 2.
4. Wilson D. Fear in the fields, parts 1 and 2.The Seattle Times, July 1997 3 1, 10–11 and July 1998 4 1,8–9.
5. Fertilizer concerns prompt new standards;Hileman;C & E News,1998