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Photographs and pictures are documents . Chamberlin , published in 1929 , begins “ The names of great original thinkers are milestones along the path of exploration that penetrates the domain of the unknown . Transit routing domains are deployed to carry transit ( i.e ., inter-domain ) traffic ; backbones and providers are TRDs . Mechanics who repair cars are engineers . He added that " some of the best pickets on the picket lines are women , and some of the toughest pickets on that picket line are women .