This letter, dated 2-11-1910, is from Manager Eggens to Robert M. Colt of F.J &G Railroad and future member of the board of the Industrial League, thanking him for securing the use of J&G Park for the upcoming season.
Note the lineup listed on the letter and the picture of the grandstands, built four years earlier.
Also note that the grandstands were extended further down the right field line than our original picture of the fields, to handle the crowds!