Mackinac, Straits of. Bridge across Straits of Mackinac, Mich., report to accompany H. R. 12898 [granting consent of Congress to Mackinac Straits Bridge Authority to construct toll bridge or series of bridges, causeways, and approaches thereto, across Straits of Mackinac at or near point between St. Ignace, Mich., and Lower Peninsula of Michigan]; submitted by Mr. Chapman.