Ok from left to right.
1st one
P.= Pionier-Bataillon
C. or d,C = ( Gardes ) du corps
D. =Division, Direktion, Dragoner, Depot, Desiziplinar-(Abteilung)
2nd.
G. = Garde-(Regiment), Gardekorps ( Generalkommando nebst Feldverwaltungsbehoerden), Grenadier-(Regiment), ( maschinen-) Geweher, Garnison, Gefaengnis.
B. = Brigade,Bezirk,Baeckerei-Abteilung,Bruecken(Train),Batterie,Betriebs,Bekleidungs-(Amt)
N= no information.
3rd.
This is the only one I feel comfortable identifying for you.
B.11.R.7.9. = Bayerisches Infanterie-Regiment 11,Kompagnie 7, Waffe Nr 9.
This is not as straight forward as one may think that's why I would recommend buying the book there are many possibilities, the font also plays a roll, the placement and combination of letters and numbers also all both play rolls in reading the marks.
I hope this helps you out a bit, like I mentioned before I'm certainly not an expert but just made an effort to try and help. Everyone interested in the subject IMO should purchase Jeffs book and dig in.