Looking for very long book about the Lincoln Anministration?

I have this book in hard copy but it is packed in one of 15 boxes until next summer & I can't remember the name of it. I want to see if I can find a digital copy. It is a really LONG detailed book about the day to day events of the Lincoln Administration written as if narrative by his private secretaries John Hay & John Nicolay. It is written in a style like Edward Rutherford & somewhat like James Michener probably about 1500 pages. I think it was published sometime about 1990-2005. Does anyone have any idea??