J Lester

AN EXAMINATION OF THE DEFECTS OBSERVED IN SIX KILOMETRES OF SEWERS

J Lester, D M Farrar, 1979 .

COMPUTER RECORDING OF DEFECTS IN SEWERAGE SYSTEMS OBSERVED IN CLOSED CIRCUIT TELEVISION SURVEYS

J Lester, 1979 .

Classification of defects in sewerage systems observed in closed circuit television surveys

J Lester, D M Farrar, J Gale, 1978 .