1.   And yet the attempt to compare eras is irresistible.

2.   Everybody is comparing eras.

3.   He would not compare his era with others.

4.   Historians acknowledge the limitations of comparing different eras.

5.   It becomes even more difficult to compare eras because the game has changed so drastically, from the style played to the number of teams to the economic structure.

6.   Weisbrot says the effect is best seen by comparing two eras.

7.   Spahn, who pitched in the generation before Koufax and Bench, hesitated to compare eras.