Ralph W Hansen

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1) Motor oils: classifications and service

Author

Hansen, Ralph W

2) Methane generation from livestock wastes

Author

Hansen, Ralph W

3) Building insulation for comfort and energy conservation

Author

Hansen, Ralph W

4) On-site water supply and wastewater disposal: quality maintenance of the water cycle

Author

5) Operation of septic tank systems

Author

6) Large tractor operation: fallacies and facts

Author

Downs, H. Willard

7) Septic tank installation and construction

Author

8) Septic tank systems: problems and promises

Author

9) Selecting energy-efficient tractors

Author

Downs, H. Willard

10) Non-soil dispersal sewage systems

Author

11) Estimating farming fuel requirements

Author

Downs, H. Willard

12) Wastewater management alternatives for small Colorado communities

Author