...This would have been the greater danger had not the sea been for some while free of obstacles... 
Robert Louis Stevenson 「Kidnapped」
...There are, however, many and serious obstacles to a continued navigation for hundreds of miles at a stretch...
David Livingstone 「Missionary Travels and Researches in South Africa」
...But France throws few obstacles, ifany, in the matter of plantation enterprise...
Mary H. Kingsley 「Travels in West Africa」
... Abyssinian slave-girls—Khartoum—The Soudan under Egyptian rule—Slave-trade in the Soudan—The obstacles ahead ...
Samuel White Baker 「In the Heart of Africa」
... Gidi Mavunga, finding me in his power, began, like a thoroughbred African, to raise obstacles...
Richard F. Burton 「Two Trips to Gorilla Land and the Cataracts of the Congo Volume 2」
...Various obstacles delayed us on the way, and the shades of evening began to close in rapidly; night already reigned over the forest...
Richard F. Burton 「Two Trips to Gorilla Land and the Cataracts of the Congo Volume 1」
... They knew that they must pass through Baltimore, but they did not know the obstacles that they would have to surmount in the Monumental City...
William Still 「The Underground Railroad」
...The nights and the distance were both obstacles to her visits...
Frederick Douglass 「My Bondage and My Freedom」
...The emancipated Negro struggles up to-day against many obstacles, theentailment of a brutal slavery...
Booker T. Washington, et al. 「The Negro Problem」
...That they have not reached perfectionin one generation, with the obstacles that the parents have beencompelled to overcome, is not to be wondered at...
Booker T. Washington 「The Future of the American Negro」
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