Hogg, Ian V, (1970) The Guns 1939 / 45

Hogg, Ian V, (1971) The Guns 1914-1918

Ardry, Robert (1977) The Hunting Hypothesis

Sandosuosso, Antonio (2004)  Barbarians, Marauders and Infidels   

http://www.thudscave.com/ Hrdlicka, Daryl  How Hard Does It Hit
 
http://bookofluke.blogspot.com/2008/01/old-is-new-again.html  
 
http://en.wikipedia.org/wiki/Cannon - various sub-topics