If you have access to Heritage Quest through your public library, you can view the book (and print out individual pages as needed....).
The name of the original book is: "The Descendants of Jacob Schoff Who Came to Boston in 1752 and Settled in Ashburnham in 1757 With an Account of the German Immigration Into Colonial New England" By Wilfred H Schoff Philadelphia 1910.
The revised book is entitled: "The Descendants of Jacob Schoff Boston, 1752" byAlvin Schoff Whitmore Ellsworth, Maine 1987.
The revised edition is not on Heritage Quest (at the present time), but the author's family still has copies of the book.The last time I talked with them, they were selling the books at $15 each or 3 for $30.I ordered three and they included a fourth!
There are errors.But as with any large scale research project, verify it yourself and use it as a guide.I have found several errors myself.However, the sources are identified and that should be a big help in your own research.My personal opinion is that if I cannot see the same documents and come to the same conclusion, I doubt the accuracy of the research.
With the revised edition, the author only contacted some of the descendants and there are large gaps in the research.I'm disappointed in the research done on the daughters, because, although the daughters married someone of another last name, their children tended to marry back with the Schoffs!For example, Lucy Schoff (daughter of Daniel, son of Jacob) married Hardin Willard.Their son Leander Willard married Lucy Ann Schoff (daughter of Jeremiah, son of Daniel, son of Jacob).
If you have any questions, you can email me directly at firstname.lastname@example.org