Research Catalog

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Neighboring Subject Headings
Diesel locomotives	49	170
Diesel motor	66	679
Air filters	-	2
Alternative fuels	8	28
Congresses	-	6
Government policy	1	1
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Bibliography	-	1
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Diesel motor exhaust gas	32	55
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Related Headings
Diesel motor -- Alternative fuels	8	28
Spark ignition engines	36	103
Diesel motor	66	679
Spark ignition engines -- Alternate fuels -- Congresses	-	13
Spark ignition engines -- Alternate fuels	7	38
Coal	1275	2697
Coal -- Congresses	-	77
Spark ignition engines -- Exhaust emissions	1	1
Spark ignition engines -- Exhaust emissions -- Congresses	-	1
Motor vehicles -- Motors (Diesel)	5	9

Subject Heading "Diesel motor -- Alternative fuels -- Congresses"