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NIST NCSTAR 1 (2005), p. 6. Sivaraj Shyam-Sunder; Richard G. Gann; William L. Grosshandler; Hai S. Lew; Richard W. Bukowski; Fahim Sadek; Frank W. Gayle; John L. Gross; Therese P. McAllister; Jason D. Averill; James R. Lawson; Harold E. Nelson; Stephen A. Cauffman (Setembro de 2005). Final Report of the National Construction Safety Team on the Collapses of the World Trade Center Tower (NIST NCSTAR 1)(PDF) (Relatório). Federal Building and Fire Safety Investigation of the World Trade Center Disaster. National Institute of Standards and Technology (NIST)
NIST NCSTAR 1 (2005), p. 1. Sivaraj Shyam-Sunder; Richard G. Gann; William L. Grosshandler; Hai S. Lew; Richard W. Bukowski; Fahim Sadek; Frank W. Gayle; John L. Gross; Therese P. McAllister; Jason D. Averill; James R. Lawson; Harold E. Nelson; Stephen A. Cauffman (Setembro de 2005). Final Report of the National Construction Safety Team on the Collapses of the World Trade Center Tower (NIST NCSTAR 1)(PDF) (Relatório). Federal Building and Fire Safety Investigation of the World Trade Center Disaster. National Institute of Standards and Technology (NIST)
NIST NCSTAR 1 (2005), pp. 5–6. Sivaraj Shyam-Sunder; Richard G. Gann; William L. Grosshandler; Hai S. Lew; Richard W. Bukowski; Fahim Sadek; Frank W. Gayle; John L. Gross; Therese P. McAllister; Jason D. Averill; James R. Lawson; Harold E. Nelson; Stephen A. Cauffman (Setembro de 2005). Final Report of the National Construction Safety Team on the Collapses of the World Trade Center Tower (NIST NCSTAR 1)(PDF) (Relatório). Federal Building and Fire Safety Investigation of the World Trade Center Disaster. National Institute of Standards and Technology (NIST)
NIST NCSTAR 1 (2005), p. 8, 65. Sivaraj Shyam-Sunder; Richard G. Gann; William L. Grosshandler; Hai S. Lew; Richard W. Bukowski; Fahim Sadek; Frank W. Gayle; John L. Gross; Therese P. McAllister; Jason D. Averill; James R. Lawson; Harold E. Nelson; Stephen A. Cauffman (Setembro de 2005). Final Report of the National Construction Safety Team on the Collapses of the World Trade Center Tower (NIST NCSTAR 1)(PDF) (Relatório). Federal Building and Fire Safety Investigation of the World Trade Center Disaster. National Institute of Standards and Technology (NIST)
NIST NCSTAR 1 (2005), p. 8. Sivaraj Shyam-Sunder; Richard G. Gann; William L. Grosshandler; Hai S. Lew; Richard W. Bukowski; Fahim Sadek; Frank W. Gayle; John L. Gross; Therese P. McAllister; Jason D. Averill; James R. Lawson; Harold E. Nelson; Stephen A. Cauffman (Setembro de 2005). Final Report of the National Construction Safety Team on the Collapses of the World Trade Center Tower (NIST NCSTAR 1)(PDF) (Relatório). Federal Building and Fire Safety Investigation of the World Trade Center Disaster. National Institute of Standards and Technology (NIST)
NIST NCSTAR 1 (2005), p. 10. Sivaraj Shyam-Sunder; Richard G. Gann; William L. Grosshandler; Hai S. Lew; Richard W. Bukowski; Fahim Sadek; Frank W. Gayle; John L. Gross; Therese P. McAllister; Jason D. Averill; James R. Lawson; Harold E. Nelson; Stephen A. Cauffman (Setembro de 2005). Final Report of the National Construction Safety Team on the Collapses of the World Trade Center Tower (NIST NCSTAR 1)(PDF) (Relatório). Federal Building and Fire Safety Investigation of the World Trade Center Disaster. National Institute of Standards and Technology (NIST)
(NIST NCSTAR 1–6 2005, pp. lxvii–lxix). O NIST lista os andares reformados como 77, 78, 85, 88, 89, 92, 96 e 97, além de 5 andares não especificados. Embora a substituição da proteção contra incêndio tenha sido especificada em 1,5 polegada de espessura, o NIST constatou que a espessura média era de 2,5 polegadas (64 mm). (NIST NCSTAR 1–6 2005, p. xl) O NIST concluiu que "a condição existente da proteção contra incêndio antes do impacto da aeronave e a espessura da proteção contra incêndio no sistema de piso do WTC não desempenharam um papel significativo". National Construction Safety Team (Setembro de 2005). Federal Building and Fire Safety Investigation of the World Trade Center Disaster (NCSTAR 1–6) (Relatório). Structural Fire Response and Probable Collapse Sequence of the World Trade Center Towers. National Institute of Standards and Technology (NIST) National Construction Safety Team (Setembro de 2005). Federal Building and Fire Safety Investigation of the World Trade Center Disaster (NCSTAR 1–6) (Relatório). Structural Fire Response and Probable Collapse Sequence of the World Trade Center Towers. National Institute of Standards and Technology (NIST)