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"1950 Census of Population"(PDF). 1: Number of Inhabitants. Bureau of the Census. 1952. Section 6, Pages 21-7 through 21-09, Massachusetts Table 4. Population of Urban Places of 10,000 or more from Earliest Census to 1920. Archived(PDF) from the original on July 21, 2011. Retrieved July 12, 2011. {{cite journal}}: Cite journal requires |journal= (help)
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C.B. Tillinghast. The free public libraries of Massachusetts. 1st Report of the Free Public Library Commission of Massachusetts. Boston: Wright & Potter, 1891. Google booksArchived February 15, 2023, at the Wayback Machine
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July 1, 2007 through June 30, 2008; cf. The FY2008 Municipal Pie: What's Your Share? Commonwealth of Massachusetts, Board of Library Commissioners. Boston: 2009. Available: Municipal Pie ReportsArchived January 23, 2012, at the Wayback Machine. Retrieved August 4, 2010
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"Center for Lowell History". University of Massachusetts Lowell Libraries. Archived from the original on December 15, 2019. Retrieved December 15, 2019.