$a Kp. A manual of scientific enquiry : prepared for the use of officers in Her Majesty's navy and travellers in general / orginally ed. by John F. W. Herschell. - 4th ed., superintended by Robert Main. - London, 1871.
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$a GBV online
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$a LCA online
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$a en.wikipedia, 07.02.13 $b (Robert Main (1808-1878))