These are from the French encyclopedia Nouveau Larousse Illustre published in Paris in 1900 by Claude Auge. [Updated to add some better quality images of French uniforms from the 1897 edition]
French Uniforms (1897/1900):
Austrian Uniforms 1900:
Belgian Uniforms (1900):
Prussian Uniforms (1900):
Neat book! Where did you find it?
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