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Keywords:
ERECTION,
METHODS,
IRON,
BRIDGES,
CONSTRUCTION,
METALS,
GIRDERS,
PIERS,
RIVERS,
SPANS,
SUPERSTRUCTURES,
ROLLING OVER,
VIADUCTS,
SCAFFOLDING,
PONTOONS,
FLOATING,
ROLLERS,
CONTINUOUS,
ARCHES,
OVERHANG,
COSTS,
DOURO,
PORTUGAL
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© Thomas Telford and ICE
1881
