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/img/108623.hughes-explanation-of-chichester-navigation.pdf

/img/108623.t-19.pdf

/img/108625.afm-51-40-drift.pdf

/img/108627.yoder sextant.jpg

/img/108627.yoder vernier.jpg

/img/108627.yoder-sextant.jpg

/img/108627.yoder-vernier.jpg

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/img/108689.image001-gif-01c9f00e-6bfb00b0

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/img/108716.bris-sextant.pdf

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