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Note: EPA no longer updates this information, but it may be useful as a reference or resource.

Please see www.epa.gov/nsr for the latest information on EPA's New Source Review program.

April, 1981 PSD Guidance Document 9.4

This document provides guidance to persons intending to submit a PSD permit application for a major source that has the potential to impact a Class I area managed by the National Park Service (NPS). This is an NPS document and does not necessarily reflect EPA policy.

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