1. Soil organic matter and its role in crop production;Meurant,1973
2. Blue gold: the fight to stop the corporate theft of the world's water;Barlow,2002
3. Sustainable development at risk: ignoring the past;Hulse,2007
4. Environmental impact of animal manure management in the southern plains;Daniel,1993
5. Methane recovery from animal manures: the current opportunities casebook;Lusk,1998