Rest, Ortner, Ilming ,
Verlag Militaria , Austria , 2002 (English)
Perhaps not German
Pickelhaube but this is a major labor of love. HUGE.
More than 1400 pictures and the only explanation in
English of the K.u.K. Army. It is all here. Referenced,
backed up, researched and organized. If you want
Austrian stuff this is the book. They printed it in
German also. Two thumbs up. I use it as research not
reading. My goodness these guys actually understand the
morass of Austrian uniforms.