Hudson Bay. Surface water supply of United States, 1940; pt. 5, Hudson Ray and upper Mississippi River basins; prepared under direction of Glenn L. Parker, chief hydraulic engineer, H. C. Beckman, F. C. Christopherson, L. C. Crawford, H. E. Grosbach, R. G. Kasel, J. H. Morgan, P. R. Speer, and A. H. Tattle, district engineers.

Tools