Boyd, Mark F.2012-01-202012-01-202012-01-20http://hdl.handle.net/2152.3/304Rat guard on ship mooring line to prevent rats from entering and exiting the ship.5 x 7 in. black-and-white photographimage/jpegen-USBubonic plagueGalveston Plague LaboratoryPortRats -- ControlUnited States Public Health Service