1) Walker, Bob, The Cats' House.
2) Walker, Bob (Robert W.), writes about rock music, bootlegs, and discography Hot Wacks.
3) Walker, R. G. (Robert Graham), professor at University of Sydney, Privatisation
4) Walker, Robert E., wrote about football coaching, The Swing End Offense.
5) Walker, Bob, professional hobby manufacturer (Accurail, now retired) and model builder, Scratchbuilding for Model Railroaders