• Darwin Archive | 'Origin of Species': portfolios I | Materials for chapter 11: 'Geographic distribution' | Glen Roy Portfolio (DAR 50C) | NS I Glen Roy Notes-24 Note, 1809-01-01 - 1882-04-30 | An error of 2 inches in 100 yards wd give nearly 36 in mile, 1809-01-01 - 1882-04-30

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