A second layer of planks is overlaid on the first and held in place by reusing the waxed screws and washers that held the first layer

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A second layer of planks is overlaid on the first and held in place by reusing the waxed screws and washers that held the first layer

© WSI

A second layer of planks is overlaid on the first and held in place by reusing the waxed screws and washers that held the first layer photo copyright WSI taken at and featuring the class