John Adams 
Familiar Letters of John Adams and His Wife Abigail Adams During the Revolution with a Memoir of Mrs. Adams [PDF ebook] 

This book contains a collection of letters between John and Abigail Adams. The letters not only reveal the depth of their relationship but also detail the sacrifices, the deprivations, and the emotions of war and separation in a personal, unguarded way. The balance of the masculine and feminine perspectives makes this book particularly interesting and unique.