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Showing below up to 20 results in range #21 to #40.

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21. (hist) ‎Biomass (Technical Brief) ‎[24,419 bytes]
22. (hist) ‎How to Recycle Rubber ‎[23,629 bytes]
23. (hist) ‎How to Control Termite without Chemicals ‎[23,282 bytes]
24. (hist) ‎How to Measure the Energy Used to Fire Clay Bricks ‎[23,244 bytes]
25. (hist) ‎How to Build Human-Powered Water-Lifters ‎[22,981 bytes]
26. (hist) ‎How to Plan a Micro Hydro-power Plant ‎[22,689 bytes]
27. (hist) ‎How to Make Candles ‎[22,584 bytes]
28. (hist) ‎Gene Pool Protected Fishing ‎[22,329 bytes]
29. (hist) ‎Refrigeration for Developing Countries ‎[22,154 bytes]
30. (hist) ‎How to Use Sun Power ‎[21,789 bytes]
31. (hist) ‎Beekeeping Principles ‎[21,421 bytes]
32. (hist) ‎How to Grow Neem Trees ‎[21,407 bytes]
33. (hist) ‎How to Pack Food in Glass ‎[21,235 bytes]
34. (hist) ‎How to Build Causeways out of Dry Stone ‎[21,227 bytes]
35. (hist) ‎How to Use Diesel Engines ‎[20,956 bytes]
36. (hist) ‎How to Calculate the Energy Efficiency of your Lime Burning Process ‎[20,529 bytes]
37. (hist) ‎How to Harvest Run Off Rainwater ‎[20,369 bytes]
38. (hist) ‎How to Build the ARTI Compact Biogas Digestor ‎[20,326 bytes]
39. (hist) ‎How to Make a Tsetse Fly Trap ‎[19,889 bytes]
40. (hist) ‎Pozzolanas - Rice Husk Ash (RHA) and Pulverised Fuel Ash (PFA) - Technical Brief ‎[19,840 bytes]

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