Those are terrific--love the one of her sitting on the chair in Western costume.
That photo (and yes it does look like Beaton doesn't it? among other things, everyone looks great at the same time--a RARITY, lol)
appears in the excellent Chujoy book The New York City Ballet (Knopf, 1953) which also has lots of other great photos
not appearing most other places and some very interesting commentary by various people involved in NYCB...
Excellent! You've made my day with that info, Jsmu.
I've noticed that there are various mostly out-of-print publications from the 50s through 70s on the subject of the NYCB, but it's hard to know which are worth seeking out. I've found one great one at the library: George Platt Lynes, "Ballet". A really awesome set of photos.
And...I just happened to notice that someone had put together a nice slideshow of Tanny photos - a few I haven't seen before...(note: at the end you'll see a link to a Suzanne Farrell slideshow by the same poster - that's very nice too)