Oil Shale
A Scientific-Technical Journal

2004, Vol. 21, No. 4

	Editor's Page
1.	J. Purga. Today's Rainbow ends in Fushun	269-272
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2.	I. Johannes, L. Tiikma. Kinetics of oil shale pyrolysis in an autoclave under non-linear increase of temperature	273-288
3.	Yong Guang He, Yong Hui Zhao. Modification of gas blower to enhance the capacity of Fushun oil shale retort	289-294
4.	A. Laur, K. Tenno, J. Aps. Assessment of external costs in oil shale-based electricity production in Estonia	295-308
5.	K. Kärmas, T. Tenno, K. Hellat. Formation of sulphide and its chemical equilibrium in sewage pipes. Influence of H2S to aerobic microorganisms of activated sludge	309-320
6.	T. Kuznetsova, H. Pärn. Some results of the afforestation of closed oil shale opencasts with exotic conifers	321-332
7.	O. Roots. Polychlorinated biphenyls (PCB), polychlorinated dibenzo-p-dioxins (PCDD) and dibenzofurans (PCDF) in oil shale and fly ash from oil shale-fired power plant in Estonia	333-340
	*historica*
8.	E. Maremäe. Uranium production from imported raw material at Sillamäe in 1949-1989	341-356

	Information
9.	M. Veiderma. The USA-Estonian co-operation in oil shale research and utilization	357-360
	People
10.	Ph.D. Hans Luik 50	361

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11.	Year contents: 2004, Vol. 21	363-364