SS-S-449, FEDERAL SPECIFICATION: SLAG AND STONE, CRUSHED, GRAVE, CRUSHED AND CRUSHED (FOR RAILROAD BALLAST) (08 AUG 1966) [NO S/S DOCUMENT]

SS-S-449, FEDERAL SPECIFICATION: SLAG AND STONE, CRUSHED, GRAVE, CRUSHED AND CRUSHED (FOR RAILROAD BALLAST) (08 AUG 1966) [NO S/S DOCUMENT]., This specification covers aggregates for ballast and subballast, in the construction of railroads.