 That meant extensive travel throughout the United States, visiting ships, sailing, steaming and motoring on them, inspecting them during shipyard haul outs and repairs, climbing masts, crawling through engine rooms, and not just conducting a desk-top survey from afar.The first inventory of the large historic ships in the United States, led by Delgado, was completed and published in 1990 in conjunction with J. Candace Clifford.It remains the basis for the National Park Service’s ongoing, now digital inventory.