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Sources:

Bryk, William, The Collyer Brothers, The New York Sun, April 13, 2005, https://www.nysun.com/on-the-town/col...

Collyer Brothers Park, NYC Parks, https://www.nycgovparks.org/about/his...

Langley Kept Faith With Brother to the End, Died Under Junk Near Him in Their ‘Castle,’ The Pittsburgh Press, April 9, 1947, https://news.google.com/newspapers?ni...

New Troubles Vex Collyer Brothers, Reading Eagle, January 18, 1943, https://news.google.com/newspapers?ni...

Extreme Phobias: Collyer Brothers, Psychologist World, https://www.psychologistworld.com/iss...

Collyer Mansion Will be Razed, St. Petersburg Times, July 1, 1947, https://news.google.com/newspapers?ni...

Aged Hermits Pair May Now Enjoy Undisturbed Seclusion, The Free-Lance Star, November 19, 1942, https://news.google.com/newspapers?ni...

Harlem House Mystery End; Tale of Love, Gettysburg Times, August 7, 1942, https://news.google.com/newspapers?ni...

The Shy Men, TIME, April 7, 1947, https://web.archive.org/web/201003282...