Lincoln the President (March 4, 1861 to May 3, 1865)" is a book by Henry Clay Whitney, focusing on Abraham Lincoln's presidency. It's part of a two-volume biography, with the first volume covering Lincoln's life up to his presidency. Whitney, a lawyer and friend of Lincoln, offers a personal perspective on Lincoln's time in office, drawing on his own experiences and conversations with Lincoln. 
Key aspects of the book:
Focus:
The book specifically covers Lincoln's presidency, from his inauguration to his death. 
Author's Perspective:
Henry Clay Whitney, a lawyer and friend of Lincoln, provides a unique, personal perspective on Lincoln's presidency. 
Source Material:
The book draws on Whitney's own experiences, conversations with Lincoln, and secondary sources. 
Value:
While the first volume (Lincoln the Citizen) is considered more valuable due to its personal accounts, the second volume (Lincoln the President) offers insights into Lincoln's time in office. 
Republished Editions:
The book has been republished in affordable, modern editions, making it accessible to a wider audience.