Full text copy of Rifle Training for War
Biographical Dictionary of Iowa entry for Brookhart.
Biographical Directory of the United States Congress entry for Brookhart
Find a Grave entry for Brookhart
Full text of Brown's lecture "The Life Complete" from Notable Speeches by Notable Speakers of the Greater West, edited by Harr Wagner and published by Whitaker and Ray Company in 1902.
Full text of Lincoln, The Greatest Man of the Nineteenth Century (1922).
"Biographical Sketch of Rev. Charles R. Brown" from The Student's Journal, Volume 21 published by A. J. Graham & Company in 1892.
Both volumes of Burrell's History of Washington County Iowa are available through archive.org:
A dissertation written by Daniel Clair Davis in 1960, entitled "The Hermeneutics of Ernst Wilhelm Hengstenberg: Edifying Value as Exegetical Standard" is attached.
Fr. McDaniel's author page with the Society of Midland Authors can be found here.
His full work "The Search for Smith Wildman Brookhart: A Pilgrim's Progress" can be found in the University of Iowa Special Collections online.
Additional biographical information can be found on Pollard's Wikipedia listing and in an article about Pollard entitled "Percival Pollard: The Iowa Connection" by Cora T. Dunsmore in the University of Iowa Special Collections online.