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Both books have the buildings arranged in roughly chronological order, with a geographical supplement in the back, so if you know the location but not the date, you can find where in the book it's listed.
I find two listings for New Hampshire, both in Manchester. One is the Zimmerman house from 1950, and the other is the Kalil house from 1955. If neither of these is the house your friend has, then it was probably not designed by Frank Lloyd Wright. However, there may be similar work by people associated with Wright (former students or former employees of his). This is a bit harder to research--start with your city or county offices that show land transactions, building permits, and the like, and you may be able to get the architects name. If you know who the original owners were, and they (or some family member) is still alive, you may get information that way.