See Pictures :-)
Thank you for your help and patience.
The presented object appears to be the publication "Grosser Bilder Atlas des Weltkrieges" published by Verlag F. Bruckmann in Munich Germany in the years 1915-1918. These are volumes II and III sadly volume I is missing.
This piece is in bad condition and there are serious damages visible in the images provided.
A fair market estimation would be between 20 to 40 USD.
This estimate is based on actual recent past recorded auction sales of comparable items. Retail "asking prices" can be higher and may vary.
With kind regards,