La Plante Ornamentale Branches Et Feuillages

My family recently emptied a storage unit that we have had for about 25 years. Many of the last thing belonged to my grandmother who was an antiques dealer. In the one box we found a 2 volume set of
La Plante Ornamentale Branches Et Feuillages
by P. Plauszewski
Published by A. Calavas
The volumes have prints (photos) numbered 1 thru 100. A few have dirt or something semi obscuring the plant, and all have some crumbling around the edges. But, with the exception of only 1 the crumbling is minor.
My internet reasearch did not turn up much about this so I was hoping somebody might be able to shed some light on this item. I was told by Harvard's library that it was published in 1900 and only 2 libraries in the world have this book, and not complete editions. I have tried to contact them, but have not gotten a response.
The pictures are of the cover of one and of 2 of the prints: # 1 Silphium Perfoliatum / Fuchsias Fulgens and # 90 Lantana Camara / Viburnum Lantana.
I thought they were drawings at first, but they are apparently photos. Any information I could get would be most appreciated.