
- Author: Jackson J. Spielvogel
- Language: English
- Year: 2017

- Author: Jackson J. Spielvogel
- Language: English
- Year: 2015

- Author: William J. Duiker Jackson J. Spielvogel
- Language: English
- Year: 2015

- Author: William J. Duiker, Jackson J. Spielvogel
- Language: English
- Year: 2016

- Author: William J Duiker Jackson J Spielvogel
- Language: English
- Year: 2018

- Author: Jackson J. Spielvogel
- Language: English
- Year: 2004

- Author: Jackson J. Spielvogel
- Language: English
- Year: 2014

- Author: Jackson S. Spielvogel
- Language: English
- Year: 2006

- Author: Jackson J Spielvogel
- Language: English
- Year: 2009

- Author: Jackson J Spielvogel
- Language: English
- Year: 2011