Telford Grant Maple passed away in 2005 with no heirs. His book was published privately, and is no longer available for sale. It was not sold for profit -- he charged only for the cost of printing. He also distributed CD versions at cost. While, strictly speaking, it is improper to put large passages on WikiTree, in practice it IS THE PROPER THING TO DO!.
Grant devoted many years of his life to the study of Maple genealogy, and he shared his work freely with others. His book was partly based on the earlier notes of John Jameson Mapel (1848-1932), who interviewed many Maple families. As such, it contains many unreferenced statements, which do not fit well into a standard Wikitree format. I think it is best to put his writing out in its original form, and let researchers decide what to make of it.
What is not OK is to copy passages from the book and then pull out a few references as sources, making it unclear who actually wrote the passages. Label passages clearly as quotes from T. Grant, and give him his due!