^Numbers represent an alphabetical ordering by significant words. Various colorings, defined here, differentiate National Historic Landmarks and historic districts from other NRHP buildings, structures, sites or objects.
^The eight-digit number below each date is the number assigned to each location in the National Register Information System database, which can be viewed by clicking the number.
^Mayer-Hahdahl, Alexandra (2006-12-09). "A statement to a statesman". Lowell Sun. State, city and education officials took a step toward reviving Morse's memory yesterday afternoon, when they dedicated Middlesex Community College's Federal Building in honor of the late U.S. representative, diplomat and United Nation's official. ... The dedication of the F. Bradford Morse Federal Building is one in a slew of efforts to memorialize Morse.
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