00603nam a2200169 a 450000500170000000800410001703500150005804100070007305000200008024501220010026000820022230000090030444000690031365000280038265000120041070000110042220260817163534.0                                          a.b100987930 aEN  aTE7 N25 no. 251 0aAssessment of deficiencies and preservation bof bridge substructures below the waterline, by M. C. Rissel and others  aWashington :bTransportation Research Board, National Research Council,c1982  a80 p 0aNational Cooperative Highway Research Program. Report ;vno. 251 0aUnderwater construction 0aBridges  aRissel