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		Better Farming Series 31 - Biogas: What it is; How it is made; How to use it (FAO, 1984, 52 p.)
			(introduction...)
			Preface
			Introduction
			How to build a small biogas unit
			Waste materials
			Time
			Cold weather protection
			Stirring the waste mixture
			When the gas is made
			Using your biogas
			Using the fertilizer
			Taking care of your biogas unit
			Making more biogas

Time

84. It may take up to three weeks or even a month for the waste in your biogas unit to start making gas. After that, gas will be made for about eight weeks.

85. During these eight weeks, half of the gas will be made in the first two or three weeks and the rest in the last five or six weeks.

86. If you find that not much gas is being made in the last weeks, empty the unit and start again.