Thanks, Estelle, for your research.
The photos on the government's culture site are wonderful. It took me a while to find out how to search for them. I used "Lobstein" at first, but got results only when I dropped the quotation marks. Nadar's shots of her head and upper body are amazingly beautiful. You can feel the living, breathing human being in a way that the more artificial full-length ballet poses do not suggest.
The first of your links -- archive.org -- yields the following interesting piece of casting:
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Citons encore, parmi les dieux et les déesses les plus applaudis :
mesdemoiselles Lobstein, une superbe Vénus; Torri, un Apollon plein de
noblesse; Keller, Invernizzi, Ottolini, Grange, Biot, etc.
I wonder what happened to the website Jewish-Memories.com, described by Google as follows:
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Jewish Memories. Corps de ballet de l\'Opéra de Paris avec Mlle Lobstein ... Jewish-memories: la plus grande collection mondiale de cartes postales anciennes sur l\'histoire ...
http://www.jewish-me...p;setlang=en_US
Jewish Memories. Corps de ballet de l'Opéra de Paris avec Mlle Lobstein ... Jewish-memories: la plus grande collection mondiale de cartes postales anciennes sur l'histoire ...
www.jewish-memories.com/i11850-Souvenir_du_mariage_de_Mlle_Rosine_Weill_et_de_Mr_Sylvain_Salomon.html?...