Answer:
EO 13526 & NISPOM
Explanation:
Contractors cleared under the National Industrial Security Program should look for guidance on safeguarding classified information from :
EO (Executive Order) 13526, NISPOM (National Industrial Security Programme Operating Manual)
The guidance that the contractors are looking for can be found in the EO 13526 and NISPOM.
In conclusion, the contractors can look for guidance on the safeguarding of classified information in EO 13526 and NISPOM.
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