Meanings of excellent monograph in inglés

He closes his excellent monograph in the following words:

The last word on Derues has been said by M. Georges Claretie in his excellent monograph, "Derues L'Empoisonneur," Paris.

I wish to consult a very excellent monograph on Laplace's hypothesis, which I understand is in a certain private collection in New York City.

This progress is very aptly described by Professor E. Clarapede, of the university of Geneva, who says, in his excellent monograph on the Elberfeld horses:

"This is an excellent monograph by my gifted friend, Ray Lankester!"