Effective Management in Therapeutic Recreation ServiceMarcia Jean Carter, Christen G., Ph.D. Smith, Gerald S., Ph.D. O'Morrow · First published 2014Open the Tome
The impact of tobacco use and cessation on nonmalignant and precancerous oral and dental diseases and conditionsArden G. Christen · First published 1991Open the Tome
A smoking cessation program for the dental officeArden G. Christen · First published 1988Open the Tome
The Christen family tree; descendants of Jacob Christen, Sr., Albany, Minn. Edited and compiled by Dr. Arden G. Christen, with thanks to William H. Christen and Charles H. Christen.Christen, Arden G., 1932- · First published 1957Open the Tome
