Y1AA - CONSTRUCTION OF OFFICE BUILDINGS
Y1AZ - CONSTRUCTION OF OTHER ADMINISTRATIVE FACILITIES AND SERVICE BUILDINGS
Y1CA - CONSTRUCTION OF SCHOOLS
Y1CZ - CONSTRUCTION OF OTHER EDUCATIONAL BUILDINGS
Y1DA - CONSTRUCTION OF HOSPITALS AND INFIRMARIES
Y1JZ - CONSTRUCTION OF MISCELLANEOUS BUILDINGS
Y1KA - CONSTRUCTION OF DAMS
Y1LB - CONSTRUCTION OF HIGHWAYS, ROADS, STREETS, BRIDGES, AND RAILWAYS
Y1LC - CONSTRUCTION OF TUNNELS AND SUBSURFACE STRUCTURES
Y1NE - CONSTRUCTION OF WATER SUPPLY FACILITIES
Z1KA - MAINTENANCE OF DAMS
Z1LB - MAINTENANCE OF HIGHWAYS/ROADS/STREETS/BRIDGES/RAILWAYS
Z1LC - MAINTENANCE OF TUNNELS AND SUBSURFACE STRUCTURES
Z2KA - REPAIR OR ALTERATION OF DAMS
Z2KB - REPAIR OR ALTERATION OF CANALS
Z2LB - REPAIR OR ALTERATION OF HIGHWAYS/ROADS/STREETS/BRIDGES/RAILWAYS