Update on finding the book:
I decided to contact the person who quilted the quilt that had the blue heron block in it. She contacted the woman who made the quilt. Well, was I surprised! I couldn't find Debbie Fields' blue heron block because...the woman created her own! It fit in so well with the others, I was fooled. She has graciously offered to send me a picture and the outline she used for it.
So..I may end up with a small wallhanging for the family cottage after all (and after all of these other truly important projects are done).
Thanks again for your help,
lots2do