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Portable Network Graphic  |  1991-05-30  |  2KB  |  283x311  |  1-bit (2 colors)
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OCR: 340 Total Ozone - Dobson units 320- 300- 280- 260- 240- 220- 200- 180+ 1955 1965 1975 1985 Year (measured in Oct.) ANTARCTIC OZONE Farnan , UK