"Flugzeugbeobachter" plane WW1 ?

Does somebody know which kind of planes (must be dubble seat) the Germans used during 1.WW. for observation fligths?

[Cigogne]

1914: Rumpler Taube, Albatros B.II, LVG B.I, Rumpler B.I, DFW B.II, Otto Doppeldecker (pusher), other Taube types...

1915: LVG B.II, LVG C.I, LVG C.II, Albatros C.I, Aviatik C.I, Otto C.I, Fokker A.II, Pfalz A.I-II, Ago C.I...

1916: LVG C.II, LVG C.IV, Albatros C.III, C.V, C.VII, AGO C.I, Aviatik C.I, II, III, Rumpler C.I, C.III

1917: DFW C.V, LVG C.V, Halberstadt CL.II, Hannover CL.II-III, Rumpler C.IV, AGO C.IV

1918: DFW C.V, LVG C.V-VI, Halberstadt CL.II-IV, Halberstadt C.V, Hannover CL.II-IIIa, Hannover CL.V, Rumpler C.IV, VI, VII, Rubild.

There are some minor types or sub-types missing, I've just put the main types...

thanks a lot.

hans