Book 5 and Book 6 in Wolf series

Finished book 5 in the Wolf series and Margaret (my better half) is editing it now.  We are about to head to the hill country of Texas to do a little geographical research needed for book 6 (a friend of ours owns a ranch out there).  One of the most enjoyable parts of writing, in my opinion, is the research that we put into each book in our attempt to accurately place each town, river, or even a building of historical significance.  Some of these things I remember from my childhood but others have just been too long ago for me to remember.