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Library - Directive History
N PR 8020 12D Need help?
Status: CURRENT
Subject: Planetary Protection Provisions for Robotic Extraterrestrial Missions
Responsible Office Code: DA
Effective Date: April 20, 2011
Expiration Date: April 20, 2016
Cancellation Date:  
Document Cancelling this Directive (if Cancelled):  
Documents Cancelled by this Directive:
N PR 8020 12C   -   Show History
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