Pederson, P.O. <br/><br/>
Propagation of radio waves along the surface of the earth in the atmosphere, with appendix   
by P.O. Pederson. 
 - Copenhagen  Danmarks Naturvidenskablige Samfund G.E.C. Gad  1927 
<br/><br/><label>Dewey Class. No.: </label>621.38411  / N27