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For copies to be mailed to addresses outside the United States, please add $2.50 for each copy.

This bibliography was prepared by the NASA Scientific and Technical Information Facility, operated for the National Aeronautics and Space Administration by Informatics Information Systems Company.

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NATIONAL

MINISTRATO

Scientific and Technical Information Office

MARCH 1975
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION

Washington, D.C.

USA

This document is available from the National Technical Information Service (NTIS), Springfield, Virginia 22161 for $5.50. For copies mailed to addresses outside the United States, add $2.50 per copy for handling and postage.

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