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fig 257A WTC beams, posted by Fabian Villanyi at 01.09.17 (filed under: concrete steel)
fig 255A WTC pillar dimensions, posted by Fabian Villanyi at 01.09.17 (filed under: concrete steel)
fig 247A WTC pattern of the pillars, posted by Fabian Villanyi at 30.08.17 (filed under: concrete steel)