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A collection of non-proliferation studies conducted by the Institute on groups of countries, their non-proliferation commitments, fissile material stocks, and assessments of global non-proliferation efforts and events.

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A collection of Institute books on various countries' nuclear weapons programs, illicit trade, and fissile material production.

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NEW: High resolution satellite imagery taken yesterday shows the extent to which Iran has covered the tunnel entrances at the Esfahan nuclear complex with soil. The middle and southern entrances are unrecognizable and fully covered in soil. The northernmost tunnel entrance which features additional passive defense measures is backfilled with soil. No more vehicle activity is seen around the three entrances.  

It appears clear that the Iranians are seriously concerned about a US/Israeli aerial attack and/or raid against this particularly hardened nuclear facility. Backfilling the tunnel entrances would help dampen any potential airstrike and also make ground access in a special forces raid to seize or destroy any highly enriched uranium that may be housed inside difficult. It is also possible that Iran could have moved equipment or material into the tunnels to protect them, although this cannot be confirmed. Preparations like these were last observed in the days before Operation Midnight Hammer struck facilities at Fordow, Natanz, and Esfahan. 

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