DDDD - What does DDDD stand for? The Free Dictionary
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Appendix C to Subpart DDDD
of Part 63--Considerations for a small-scale kiln emission testing program.
Finally, we estimate DDDD
models to assess the impact of prevailing wage law repeal on the change time in differences by race and union status in the construction wage premium ([[gamma].
(Code of Federal Regulations 2004) contains some emission factors intended to be used with the low-risk option; however, they tend to be more broadly applied by state regulatory agencies.