Hi Kim C.

In Praise of Christmas is found in the original Oxford Book of Carols #5 on page 16. It is #138 on pg 484 of the New Oxford Book of Carols, and in the Shorter New Oxford Book of Carols, it is #80 on pg 236. It was recorded by Roberts and Barrand on one of their earlier Nowell Sing We Clear recording, but is not on the CD Best of the first three.
Tom