There are pictures, line drawings, plans and instructions for making a variety of Adirondack Guideboat paddles in, "Guideboat Paddles; An Adirondack Treasure", by Dr. Gordon L. Fisher (self-published, 2008).
Murat Vardar, on his "Paddle Making (and other canoe stuff)" shows the cover, and writes his impressions of this book here;
Also, Plate XVI in, "The Adirondack Guideboat" by Kenneth and Helen Durant (The Adirondack Museum, 1980) shows the dimensions and profile of a Grant paddle.