P r e s i d e n t 
of the Czechoslovak Socialist Republic 
Prague, June 29, 1966 
Dear Mr. President, 
Thank you for your letter and for the photo­graphs of the surface of the moon taken by the space craft Surveyor I. 
May I offer my congratulations to you and to the American scientists on this success and express my conviction that all achievements of the present tremendous development of science and human knowledge should serve the cause of peace and understanding among nations. 
Sincerely yours, 
Antonin Novotn.Y 
His Excellency Lyndon B. J o h n s o n 
President of the United States of America 
W a s h i n g t o n