NEW YORK TIMES, April 19, 1918.

A small article on page 14 says, "Great Play By Speaker" and subheaded, "Tris Rushes to Second Base and Makes Double Unassisted".  The summary reads: "Speaker trapped a fly ball dashing in to second base, executed a double play unassisted..."  This article includes the box score.  Speaker would do this again on April 29, the fourth of his career.