I have a book called Zakon Bozhy (God's Law), sort of a Pravoslavny (Russian Orthodox) primer for kids and their parents. It was first published in the 60s by Emigres in Canada, but it still uses the old alphabet, hard-signs at the end of all words without a vowel or soft-sign. If there are English translations, my guess is that it wouldn't be any older than the mid-20s, as it seems like a very Emigre thing to do. They had some very busy presses!! Much of the material, in Russian that is, would probably have been drawn from older songbooks.