 Delgado's work led to the largest group of maritime resources being designated as National Historic Landmarks since the creation of the NHL Program.Among the ships and sites he personally studied and nominated are the schooner Adventuress, USS "Albacore", the fireboat "Firefighter", the schooner "Governor Stone", the U.S. Navy tug USS "Hoga", the aircraft carriers USS "Lexington" and USS "Hornet", schooner American Eagle, the tugboat "Arthur Foss", the fireboat "Duwamish", the destroyer USS "Edson", the Victory Ship "Lane Victory", the Ambrose Ligthship, the river steamboat "Nenana", the four-masted ship "Falls of Clyde", the schooner "Bowdoin", the bark "Elissa" the nuclear ship "Savannah", and the excursion steamer "Virginia V".Delgado also conducted the NHL study for Lowell's Boat Shop in Amesbury, Massachusetts, as well as the home of former First Lady Lou Henry Hoover at Stanford University.