Recherche dans la collection - International Waterways Commission [8 plans] showing: 1) General maps of the Great Lakes System -- 2) Submerged Wir and Subordinate streetures in the Niagara River - Plate II -- 3) Profile of Niagara River, Lake Erie to Niagara Falls... -- 4) Profile of Niagara River, Lake Erie through Chippawa Channel -- 5) Diagram of submerge weir Co-efficiants etc. -- 6) and 7) are same as 5) 8) similar to 2) [cartographic material]