1. Williams, W. G., U. K. Govt. Internal Report (1954)
2. Major, R. K., U. S. Govt. Internal Report (1954)
3. Clifford, D. V., and Stacey, C. W., U. K. Govt. Internal Report (1956)
4. Humphries, C. R., and Gher, R. Jr., U. S. Govt. Internal Report (1954)
5. Williams, H. S., Pierce, E. M., Tate, S. E., U. S. Govt. Internal Report (1958)