Books by G.D. Thayer:
Books in the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Thayer, G.D.: Tables for the statistical prediction of radio ray bending and elevation angle error using surface values of the relative index (Washington, 1960), also by B.A. Cahoon and B.R. Bean (page images at HathiTrust)
Find more by G.D. Thayer at your library, or elsewhere.