Photos by Frank O'Connor/The Intelligencer ^^JSXS^S^ the discharge of dust in the area. C^J/^ '^tM #/f? £/ mf» nnlv about 10 to 15 per cent of fee StS toiled SncSe. Concrete looks like an economical way to imitate the classic look of original limestone struc^, tures. EssentiaUy, it is. It was invented by an English stonemason, Joseph Aspdin, in 1834, inspired by the grey-colored look he observed in the localsto his Portland Island home. (For a time the substance was commonly called Portland cement.) The product has been refined greatly by modern research and