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43 FR 51393, Nov. 3, 1978, unless otherwise noted.
50 FR 52921, Dec. 27, 1985, unless otherwise noted.
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Letter from the Iowa Department of Natural Resources submitted March 21, 2001, certifying that there are no small municipal waste combustion units subject to 40 CFR part 60, subpart BBBB.
[66 FR 46961, Sept. 10, 2001]