...So that was it! The combination of gruelling labor in the effort tosave mankind from the dread moon weed, and bitter censure from thevery people he was trying to save, had been too much for Van... 
Various 「Astounding Stories, August, 1931」
... The two friends conjectured his mental labor from his concentrated look, and the low exclamations which were escaping him like the echoes of an interior monologue...
Vicente Blasco Ibanez Charlotte Brewster Jordan 「The Four Horsemen of the Apocalypse」
... I know; would twelve hours’ daily labor frighten you?” ...
Alexandre Dumas, Pere 「Louise de la Valliere」
... “Ah!” said Aramis, “it is a labor that you have deprived me of, D’Artagnan;” and he pressed the musketeer’s hand in a significant manner, at the same moment as that of Athos...
Alexandre Dumas, Pere 「Louise de la Valliere」
...An economic system based on slave labor will find, sooner orlater, that the demand for the cheapest slave labor cannotlong be withstood...
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
...Thewhole movement represented the economic revolt of theslave-consuming cotton-belt against their base of labor supply...
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
...They differed, however,from purely moral and political efforts, in having as a mainmotive the economic gain which a substitution of free forslave labor promised...
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
..., the giving to the Negrothe right to sell his labor at a price consistent with his ownwelfare...
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
..."A bill respecting the transportation of persons ofcolor, for sale, or to be held to labor...
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
...It is almost needless to add that the "proper treatment" has always contained in it the essential element of slavery, namely, compulsory unpaid labor...
David Livingstone 「Missionary Travels and Researches in South Africa」
...During the day every operation must be superintended, and both husband and wife must labor till the sun declines...
David Livingstone 「Missionary Travels and Researches in South Africa」
...Their instrument of culture is the hoe, and the chief labor falls on the female portion of the community...
David Livingstone 「Missionary Travels and Researches in South Africa」
...Should the rhinoceros come back, a single roll in the great mass we had thrown on one side would have rendered all our labor vain...
David Livingstone 「Missionary Travels and Researches in South Africa」
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