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Library - Directive History
N PR 8020 12D Need help?
Subject: Planetary Protection Provisions for Robotic Extraterrestrial Missions
Responsible Office Code: GA
Effective Date: April 20, 2011
Expiration Date: January 20, 2022
Cancellation Date:  
Document Cancelling this Directive (if Cancelled): N PR 8715 24
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Documents Cancelled by this Directive:
N PR 8020 12C   -   Show History
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