여파
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http://www.epa.gov/oig/reports/2003/wtc/wtc_report_press_statement.htmNewsroom
http://www.construction.com/NewsCenter/Headlines/ENR/20011001b.asp
원인 조사
https://web.archive.org/web/20151107011043/http://www.fire.nist.gov/bfrlpubs/build02/PDF/b02044.pdf
https://web.archive.org/web/20151107011043/http://www.fire.nist.gov/bfrlpubs/build02/PDF/b02044.pdfhttp://www.fire.nist.gov/bfrlpubs/build02/PDF/b02044.pdf
http://www.fire.nist.gov/bfrlpubs/build02/PDF/b02044.pdf웨이백 머신 - 위키백과, 우리 모두의 백과사전
https://ko.wikipedia.org/wiki/%EC%9B%A8%EC%9D%B4%EB%B0%B1_%EB%A8%B8%EC%8B%A0CISC-ICCA Québec :: Babillard - Steel and sustainability 2: Recovery strategiesThe long unedited version
https://web.archive.org/web/20080917083431/http://quebec.cisc-icca.ca/content/messageboard/archives/000171.asphttp://quebec.cisc-icca.ca/content/messageboard/archives/000171.asp
http://quebec.cisc-icca.ca/content/messageboard/archives/000171.aspSkyscraper Safety Campaign - Must-Read Articles
http://www.skyscrapersafety.org/html/article_09112002.html
2001년 9월 11일
http://www.bmcc.cuny.edu/news/news.jsp?id=720
http://www.bmcc.cuny.edu/news/news.jsp?id=720Collapse of WTC7
https://www.youtube.com/watch?v=4k6GMddY-lQAttention Required! | Cloudflare
http://www.crainsnewyork.com/apps/pbcs.dll/article?AID=/20081113/FREE/811139992The National September 11 Collection
http://americanhistory.si.edu/september11/collection/record.asp?ID=74
건축 디자인
Asbestos Could Have Saved WTC Lives | Fox News
https://web.archive.org/web/20121016123220/http://www.foxnews.com/story/0,2933,34342,00.html404 | Fox News
http://www.foxnews.com/story/0,2933,34342,00.html웨이백 머신 - 위키백과, 우리 모두의 백과사전
https://ko.wikipedia.org/wiki/%EC%9B%A8%EC%9D%B4%EB%B0%B1_%EB%A8%B8%EC%8B%A0Search Results | Seattle Times Newspaper
https://web.archive.org/web/20080414205734/http://archives.seattletimes.nwsource.com/cgi-bin/texis.cgi/web/vortex/display?slug=1687698&date=19930227http://archives.seattletimes.nwsource.com/cgi-bin/texis.cgi/web/vortex/display?slug=1687698&date=19930227
http://archives.seattletimes.nwsource.com/cgi-bin/texis.cgi/web/vortex/display?slug=1687698&date=19930227
세계 무역 센터의 붕괴
A NATION CHALLENGED: THE BUDGET; City's Budget Is Battered In the Aftermath of Attack (Published 2001)
http://www.nytimes.com/2001/10/03/nyregion/03BUDG.html