 The temperature in the Archives Tower is maintained at sixty-eight degrees Fahrenheit and humidity is kept at forty-five to fifty percent.Records are stored in acid-free folders and boxes.Among the treasures housed at the State Archives is the 1681 Charter from Great Britain's King Charles II to William Penn, the 1737 Walking Purchase, an 1857 photograph of the Horseshoe Curve, photographs of the ruins of Chambersburg taken in 1864, the 1878 Death Warrant for John J. Kehoe  and a letter to Governor Duff relating to the 1948 Donora smog disaster.