| http://www.w3.org/ns/prov#value | - Because of the general lack of experience in this area, the Administrator, on May 31, 1972, permitted those states who could not rely on a stationary source approach to defer submission of their transportation control strategies for approximately one year beyond the statutory deadline, until February 15, 1973, and granted 21 states, including Pennsylvania, a two-year extension for the attainment d
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