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Technical Note: The illustrations were scanned at 500dpi and resized to 25% (125dpi). They will therefore display slightly larger than their original size; the exact value depends on your monitor settings. The Frontispiece and Figures 78 and 171 were printed as full-page plates and resized to 1/6, so they will be a little smaller proportionally. The quality of the photographs reflects the quality of the printed book.
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