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author
c
calver-george
book-new-edition-of-hints-on-silver-glass-reflecting-telescopes-manufactured-by-mr-g-calver-fraswith-directions-for-silvering-adjusting-c
read-new-edition-of-hints-on-silver-glass-reflecting-telescopes-manufactured-by-mr-g-calver-fraswith-directions-for-silvering-adjusting-c
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