“Until more formal U.S. Government guidance is developed and perhaps a multilateral approach is developed to reflect various nations’ views on lunar hardware of scientific and historic value, NASA has assembled this document that contains the collected technical knowledge of its personnel – with advice from external experts and potential space-faring entities – and provides interim recommendations for lunar vehicle design and mission planning teams. As such, this document does not represent mandatory USG or international requirements; rather, it is offered to inform lunar spacecraft mission planners interested in helping preserve and protect lunar historic artifacts and potential science opportunities for future missions.”
Full report: NASA’s Recommendations to Space-Faring Entities: How to Protect and Preserve the Historic and Scientific Value of U.S. Government Lunar Artifacts
Official website of the Lunar Orbiter Image Recovery Project (LOIRP)