8 x 10.5 inches with stiff cardboard covers, manuals mostly about "Locks Division" canal repairs with frequent pictures. "Strut Arm Assembly Replacement Proceedure, Chamber Caissons Installation And Removal Procedures, Center Wall Culvert Inlet/Outlet Bulkheads Installation & Removal Procedures, Installation, Operation And Removal Of Culvert Dewatering Pumps, Miter Gate Crank Gear Re0placement Procedures, Center Wall Culvert Elevators, Split Bevel Gear Assembly, Center Wall Bulkheads In Side Wall Culvert Intake Screen slots, Side Wall Culvert Intake Screens, Chamber Dewatering And Filling Procedures Gatun Locks, Installation And Removal Of Lateral Culvert Plugs and Side Wall Adit, Drainage Culvert And T-Culvert Bulkheads.