Here is Nicole's address at the Provo MTC:
Sister Nicole LeAnne Neal
2007 N 900 E Unit 61
Provo, UT 84602
Also, here is a site that will deliver letters to missionaries in the MTC for free! So instead of them waiting for snail mail or for their P-day to check their email, your letter can get to her the same day. There are also a variety of care packages that can be sent, for a fee, if you feel so inclined. http://mtcdelivery.com/ There are a couple of other sites listed on the sidebar that provide a similar service.
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