Open File. Compiled and Interpreted by J.L. Rosenfeld, 1957. Based on published work of J.G. Percival, L.G. Westgate, B.K. Emerson, G.E. Collins, J.M. Aitken, N. Herz, and unpublished work of L.G. Westgate, L. Lundgren, J.L. Rosenfeld, and G.P. Eaton. Scale 1:245,440