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Showing below up to 20 results in range #51 to #70.

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51. (hist) ‎How to Process Honey ‎[18,045 bytes]
52. (hist) ‎How to Provide Electricity in Rural Areas-Principles- ‎[17,740 bytes]
53. (hist) ‎How to Filter Water with a Sand Filter ‎[17,695 bytes]
54. (hist) ‎Pozzolanas - An Introduction & Technical Brief ‎[17,456 bytes]
55. (hist) ‎Kerosene and Liquid Petroleum Gas (LPG) ‎[17,264 bytes]
56. (hist) ‎How to Use the Porous Clay Pots and Pipes System ‎[17,068 bytes]
57. (hist) ‎How to Produce Essential Oils ‎[17,021 bytes]
58. (hist) ‎How to Build a Tray Dryer ‎[16,998 bytes]
59. (hist) ‎Ecological Sanitation ‎[16,922 bytes]
60. (hist) ‎How to Start a Community Seed Bank ‎[16,857 bytes]
61. (hist) ‎What to Do with Neem Seeds ‎[16,820 bytes]
62. (hist) ‎How to Make a Hydraulic Ram Pump ‎[16,136 bytes]
63. (hist) ‎How to Heat Water with Sun Power ‎[15,936 bytes]
64. (hist) ‎How to Make Bricks - Assessing the Technical Problems of Brick Production ‎[15,795 bytes]
65. (hist) ‎Pozzolanas - Calcined Clays and Shales, and Volcanic Ash - Technical Brief ‎[15,692 bytes]
66. (hist) ‎How to Make Marshmallows ‎[15,673 bytes]
67. (hist) ‎How to build a Ventilated Improved Pit Latrine ‎[15,620 bytes]
68. (hist) ‎Copyrights ‎[15,521 bytes]
69. (hist) ‎How to Prevent Food Poisoning ‎[15,492 bytes]
70. (hist) ‎How to Make Chocolate ‎[15,367 bytes]

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