...For two days Tarzan sought futilely for some clew to the whereaboutsof the machine or its occupants... 
Edgar Rice Burroughs 「Tarzan the Untamed」
...It never occurred to me that he held the clew that might bring us together again...
Louis Hughes 「Thirty Years a Slave」
...When I returned, hehad moved two paces, he said (he had reallymoved four), and we spent a half-hour stoopingover the daisies and the buttercups, looking forthe lost clew...
John Burroughs 「Bird Stories from Burroughs」
...Indeed, this quality is conspicuous among the descendants of the military and literary classes; and this fact furnishes us the clew...
Sidney L. Gulick 「Evolution Of The Japanese, Social And Psychic」
...We have now to note a peculiarity ofthese zones which ought to furnish a clew to the sun'smechanism, although up to the present time it has notbeen successfully traced out...
George C. Comstock 「A Text-Book of Astronomy」
...This idea of the sun as a developing body whose presentstate is only temporary, furnishes a clew to some of thevexing problems of solar physics...
George C. Comstock 「A Text-Book of Astronomy」
...Riches are the symbols of the great majority of the benefits of this life; they become a reality in the hands of the man who has the clew to their just application...
Paul Henri Thiery (Baron D'Holbach) 「The System of Nature, Volume 1」
...It blew so strong as to make it necessary to clew down all the sails; and until next morning [SATURDAY AUGUST 8], nothing above close-reefed top sails could be carried with safety...
Matthew Flinders 「A Voyage to Terra Australis」
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