Ordered that the opinion in this case be amended as follows:
1. Strike from the last line on page 5 the phrase “the Bituminous Coal Act of 1937,”. 2. Strike from the fifth line of page 6 the phrase “, save possibly one,”. 3. Strike footnotes 6 and 9.
4. Renumber the footnotes accordingly.
Opinion reported as amended, ante, p. 357.