Huge books, or a miniature woman?
Humungous books, look! Now if you search for this image, you’ll find it mostly attributed to being from “the Archives of Prague Castle”. Martin Halata, the head archivist at Prague Castle says nope. The photo is not from there.
The photographer is one M. Peterka. The books are probably antiphonaries*, for use in church services by the choir and cantor. Look closely and you’ll see musical notations. Whatever the background, this is a splendid photograph.
*Or perhaps, after all, this is a photograph of a miniature woman.