Block · one region of the page, as the scanner read it. It may hold a whole story, part of one, several, or an advertisement; stitching blocks into articles is the next step. Text is supplied OCR.
Page 1 · spans the page · from the scan, no model involved
Photo courtesy of Shenandoah National Park This photo was taken from Dickey Ridge along Skyline Drive, looking southwest over the Shenandoah Valley. On the left is good, clean air. On the right is air laden with sulfates and dust. Ozone cannot be determined from a photograph as it is invisible.
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