...he plane sped on through the night under control of her gyro-pilot asthe three men racked their brains for a solution of the problem... 
Various 「Astounding Stories, August, 1931」
...“But has the problem been well put? Have I brought out of the solution according to the wishes or the foresight of your royal highness?” ...
Alexandre Dumas, Pere 「The Man in the Iron Mask」
...As they were approaching the Hotel Plougastel once more, he announced that he had solved the problem...
Rafael Sabatini 「Scaramouche」
...) But I know I was feeling anything but calm, for the problem wasghastly...
John Buchan 「Mr. Standfast」
...To her, then,Lieutenant Erich Obergatz presented no different problem than did JA,the lion, other than that she considered the former the more dangerousanimal...
Edgar Rice Burroughs 「Tarzan the Terrible」
...In the morning I had a difficult problem to face...
John Buchan 「Prester John」
...Whenever the East is doubtful, and recognizes doubt, it is as dangerous as a hillside in the rains, and it only added to his problem if the Rangar found in him something inexplicable...
Talbot Mundy 「King--of the Khyber Rifles」
...To be sure, the problem had its uncertain quantities...
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
...Consequently we oftencongratulate ourselves more on getting rid of a problem thanon solving it...
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
...Thus perished, in the prime of life, that heroic traveller, at the very time when he had good reason to believe that he was about to solve the problem of the Niger’s course...
W.H.G. Kingston 「Great African Travellers」
...Thus, with very humble means, by the energy and courage of two unpretending men, was the long-disputed problem of the course of the Niger at length completely solved...
W.H.G. Kingston 「Great African Travellers」
...Speke set forth, in the hopes that before long he should settle the great Nile problem for ever...
W.H.G. Kingston 「Great African Travellers」
... If the second copyis also defective, you may demand a refund in writing without furtheropportunities to fix the problem...
Abd Salam Shabeeny 「An Account of Timbuctoo and Housa Territories in the Interior of Africa」
...' That is onlyone side of our problem, there is another...
Peter Nielsen 「The Black Man's Place in South Africa」
...He is attacking a problem much more momentous than thehandling of Mexican peons or Chinese coolies, and every step ofthe working out of this problem will be watched by the people ofthis country...
Richard Harding Davis 「The Congo and Coasts of Africa」
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