MIL-W-13518C (AMENDMENT 1), MILITARY SPECIFICATION: WOOD PRESERVATIVE: TETRACHLOROPHENOL AND PENTACHLOROPHENOL SURFACE SEALING COMPOUND (21 MAR 1969) [NO S/S DOCUMENT]., This amendment forms a part of Military Specification MIL-W-13518C, dated 11 July 1967,and is mandatory for use by all Departments and Agencies of the Department of Defense.