Here is a nice vintage 'Miniature Prayerbook' for your doll that is dated 1929 inside. Black covers with gold leaf edges. Measures just 1.5" by 2.25" and in very good shape with only minimal wear. This Catholic book was Made in Belgium and could be good with your nun dolls.
Please see the photos for condition and let me know if you have any questions.
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Tiny 1929 Miniature Doll Dollhouse Prayer Book