I have a very old, nearly disintegrating spelling book. It has no author, title page, or ISBN number. So, I was planning to retype it in order to preserve it.
But, I investigated further and found that although it is over 100 years old, it and the McGuffey readers have sold many copies (like the Bible and the dictionary) and continue to do so year after year.
So, not only can you buy yourself an old copy, it appears you can buy a new printing of the original book.
If you are looking for antique or vintage books, you may be able to find them available today. Try AbeBooks.