In the Press Notes for Opening Day, the Red Sox included three franchise records for a 60-game span in a single season.
This is mildly interesting, but I'm wondering why Elias couldn't include the actual dated between which each record was set? It must know them. (Maybe they did and the Red Sox cut them because they made the rows too wide? Who knows?)
I went to Baseball Reference and did it myself.
Hits: 105 - Wade Boggs - 1985 (July 14 to September 18) HR: 26 - David Ortiz - 2006 (June-Aug.