Materiála du geavahussii : Limiting future collision risk to spacecraft [electronic resource] : an assessment of NASA's meteoroid and orbital debris programs / National Research Council of the National Academies.

Bajilčálus : Limiting future collision risk to spacecraft [electronic resource] : an assessment of NASA's meteoroid and orbital debris programs / National Research Council of the National Academies.

Hildobáiki : Ii hildodieđu

Dilli : Dovdameahttun