1
Published: 2001;, 2001.;, 2001.
Superior document: Impact of Empire; volume1
2
Published: 2007.
Superior document: Impact of Empire, v. 7
3
Published: 2016;, 2016.
Superior document: Impact of Empire ; 22
4
Published: 2004;, 2004.
Superior document: Impact of Empire
5
Published: 2019;, 2019.
6
Published: 2006.
7
Published: 2013;, 2014.
Superior document: Impact of Empire, Volume 17
8
Published: 2011.
Superior document: Impact of empire, v. 13
9
Published: 2016;, 2016.
Superior document: Impact of Empire ; 22
10
Published: [2019]
Superior document: Impact of Empire Series ; Volume 34
11
Published: 2009.
Superior document: Impact of empire, v. 9
12
Published: 2004;, 2004.
Superior document: Impact of Empire
13
Published: 2006.
14
Published: 2007.
15
Published: 2006.
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16
Published: 2007;, 2007.