National Aeronautics and 

 Space Administration 



Washington, D.C. 

 20546 



Official Business 



Penalty for Private Use, $300 



SPECIAL FOURTH CLASS MAIL 

 BOOK 



Postage and Fees Paid 

 National Aeronautics and 

 Space Administration 

 NASA-451 



Donald J. Zinn, 

 P.O. Box 589 

 Falmouth, MA 02541 



NASA 



POSTMASTER: 



If Undeliverable (Section 1S8 

 Postal Manual) Do Not Return 



