Writing Reads: "Wee aire in the clover feild don't get sceared -- Blanch and Evee and Hattie" ["We are in the clover field. Don't get scared -- Blanche, Evie, and Hattie"].
Blanche (Ollie B) born March 16, 1891; Evie A December 1895; Hattie November 1892. Estimated date of picture is Summer 1909 (I would guess that they are teenagers of ages 18, 13, and 16).