...My work requires much study and concentration... 
Various 「Astounding Stories, August, 1931」
... With new leather belts and their revolvers at their sides, they were betaking themselves to the railway which was to carry them to the point of concentration...
Vicente Blasco Ibanez Charlotte Brewster Jordan 「The Four Horsemen of the Apocalypse」
...The essential point isthe resuscitative and invigorative concentration of Negro power inthe service of a new era and a Moslem propaganda, as well as thereaction thereby produced...
W.E.B. Du Bois 「The Negro」
...That very concentration led to a wonderful contact of manwith man which sharpened mind and sharpened thought and in the longrun made the Europe of to-day...
Booker T. Washington 「The Negro in the South」
...The concentration of land-owning on the other hand in the hands of thesingle white proprietors has gone on to a much larger extent than thecountry realizes...
Booker T. Washington 「The Negro in the South」
... "The concentration of property," says M...
P. J. Proudhon 「What is Property?」
...The degree of their caustic irritanteffects depends on their degree of concentration...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...On May 25, 1951, an unusual concentration of hoary bats wasobserved at a pond at about 3200 feet elevation, in San AntonioCanyon (Vaughan, 1953)...
Terry A. Vaughan 「Mammals of the San Gabriel Mountains of California」
...This concentration of hoary bats may have beendue to a sudden beginning of migration with a resultant concentrationof bats at certain altitudinal belts...
Terry A. Vaughan 「Mammals of the San Gabriel Mountains of California」
...On evenings that followed subsequenthot days no such concentration of hoary bats was seen...
Terry A. Vaughan 「Mammals of the San Gabriel Mountains of California」
...A four-year-old juvenile was found nearly immersed in the shallowwater of a pond on July 4, 1955; its right eye had been damagedby an especially heavy concentration of chiggers...
John M. Legler 「Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz」
...This concentration, so to say, of the nature of Adonis upon thecereal crops is characteristic of the stage of culture reached byhis worshippers in historical times...
Sir James George Frazer 「The Golden Bough」
...But the Chief knew Delamater and knew how that slow indolence could give place to a feverish, alert concentration when work was to be done...
Various 「Astounding Stories of Super-Science January 1931」
...Vice-president, if the wind continues, and this gas hassufficient concentration, it should be in Washington within the nexteight hours...
Various 「Astounding Stories of Super-Science, October, 1930」
..."Also, as youmay see, a concentration incubator, or spawning bed and food storagefor our Petrolia...
Various 「Astounding Stories of Super-Science, June, 1930」
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