Voorhis, Les books & textbook
Spearfish Canyon: A Journey Beyond the Rim
Black Hills & Bighorns Hist project /2006T Hardcover / 120 Pages
isbn-10: 0967676215 / isbn-13: 9780967676210
Bear Butte: Sentinel of the Plains
Royal Tine Publishing /2009T Hardcover / 120 Pages
isbn-10: 9676762822 / isbn-13: 9789676762825
