This is a very old out-of-print book, with some early pages missing (including those with publisher, author, etc.) about the experiences of my grandfather's regiment (304th Field Artillery) in World War I.
Books can be attributed to "Unknown" when the author or editor (as applicable) is not known and cannot be discovered. If at all possible, list at least one actual author or editor for a book instead of using "Unknown".
Books whose authorship is purposefully withheld should be attributed instead to Anonymous.