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Diesel Engine - Altitude Performance Adjustment|Page 1556 > < Diesel Engine - Altitude Performance Adjustment|Page 1554
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EPA Designated High Altitude Counties(shaded area indicates high altitude)

*Counties which have substantially all of their area above 4000 ft. Ref. Federal Register, Vol. 42, No. 76, April 20, 1977, pg. 20464.

Diesel Engine - Altitude Performance Adjustment|Page 1556 > < Diesel Engine - Altitude Performance Adjustment|Page 1554