Browse Items (2 total) Spatial Coverage is exactly "Thornton, Thornbury (Delaware County, Pa. : Township)" Browse All Search Items Browse Map Browse by Headings Sort by: TitleCreatorDateDate Added Items open in a separate tab. Close the tab to return to this list. Aerial view of Sleighton School for Girls, Thornton, Pa. Location: Thornton, Thornbury (Delaware County, Pa. : Township) Date: 1935-1945 View is looking northeast. Aerial view of Sleighton School for Girls, Thornton, Pa. Location: Thornton, Thornbury (Delaware County, Pa. : Township) Date: 1935-1945