SOLAR SYSTEM AND RADAR — GREEN AND PETTENGILL 279 



Even tliougli some important things have been done, the history 

 of radar astronomy lias barely begun to unfold. As usual when a new 

 tool becomes available, the most interesting results will be the ones we 

 cannot foresee. 



Reprints of the various articles in this Report may be obtained, 

 as long as the supply lasts, on request addressed to the Editorial and 

 Publications Division, Smithsonian Institution, Washington 25, D.C. 



