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with the ERA 7 42a United States History: loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220308125b1e08017f8b9ac96a8bae95html5thumbnails3jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=4Page 4button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220308125b1e08017f8b9ac96a8bae95html5page4jpg target=_blank img data-url=-compare-the-map-population-density-and-major-cities-gibson-began-his-careerhtmlpage=4 data-page=4 class=ts-thumb lazyload alt=Page 4: · Compare the map Population Density and Major Cities Gibson began his career in western Pennsylvania with the ERA 7 42a United States History: loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC 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