If the book is adopted curriculum (approved for classroom use in one or more states) you might run into the powerful textbook publishing industry. A book as old

If the book is adopted curriculum (approved for classroom use in one or more states) you might run into the powerful textbook publishing industry. A book as old as you mention (early 20th century) does not seem likely to still be a current adopted textbook. You would have the usual copyright and fair use concerns.