Boyd, Mark F.2012-01-202012-01-202012-01-20http://hdl.handle.net/2152.3/305Rat guards on ship mooring lines. All lines had to be rat proofed to eliminate possible transfer of plague rats from ship to port.5 x 7 in. black-and-white photographen-USBubonic plagueGalveston Plague LaboratoryPortRats -- ControlUnited States Public Health Service