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Searl, Sidney Rickey (1917) Three Methods of Street Cleaning: A Comparative Study of Motor-Driven and Horse-Drawn Flushing and Vacuum Cleaning of Paved Streets in the City Los Angeles. Bachelor's thesis, California Institute of Technology. doi:10.7907/hq61-eg11. https://resolver.caltech.edu/CaltechTHESIS:07192024-154421438
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