GSIN
*5131C
*5139B
*C112A
*C213A
*C213C
*C219A — *Highways, Roads, Railways,Airfield Runways
*Engineering Works, Not Elsewhere Specified
*Architect/Engineer Services - Airfield, Communication and Missile Facilities
*Architectural & Engineering Inspection Services
*Construction Materials - Inspection, Testing and Evaluation
*Engineering Services