. . . "Early slender skyscrapers" . . "skyscraper era" . "early skyscraper" . "Early skyscrapers" . . "skyscraper boom" . "age of skyscraper" . "early steel frame skyscrapers" . . "first skyscraper" . "buildings of a relatively modest 10 to 20 stories in height" . "skyscrapers" . "American skyscraper technology" . . "skyscraper" . "American skyscraperism" . "Early skyscrapers" . . . "tallest building in the western United States" . . . . . "first skyscrapers" . "\\\"First Great Age\\\"" . "early skyscrapers" .