Samuel Rawson Gardiner 
The Thirty Years’ War 1618-1648 [EPUB ebook] 

Samuel Rawson Gardiner was a prominent historian who specialized in 17th-century English history.  Some of Gardiner’s best known books are on historical figures such as Oliver Cromwell, and events such as The Puritan revolution and the English Civil War.  This edition of The Thirty Years’ War 1618-1648
includes a table of contents.