Urgent! Please help! Do they need reentry permit?

My parents can't come back to US after they left for 6 months due to medical reason. Do they need to apply for reentry permit or other documents in order to keep their green cards? Many thanks!

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回复:Urgent! Please help! Do they need reentry permit? -863211- 给 863211 发送悄悄话 863211 的博客首页 (439 bytes) () 03/08/2010 postreply 12:39:22

回复:回复:Urgent! Please help! Do they need reentry permit? -waiting_online_BA- 给 waiting_online_BA 发送悄悄话 (53 bytes) () 03/08/2010 postreply 13:22:14

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