This short paper estimates the costs for B-52 and B-47 hardened shelters as a function of blast pressure resistance (50, 100, 150, or 200 psi) and structural system (either reinforced concrete with steel roof or structural steel only).
Research conducted by
Peter, Marc, Jr. and C. A. Sandoval, Variations in Aircraft Shelter Costs. Santa Monica, CA: RAND Corporation, 1956. https://www.rand.org/pubs/documents/D3509.html.
Peter, Marc, Jr. and C. A. Sandoval, Variations in Aircraft Shelter Costs, Santa Monica, Calif.: RAND Corporation, D-3509-PR, 1956. As of May 11, 2022: https://www.rand.org/pubs/documents/D3509.html