Not sure, but the "*" numbers do not exactly accord with pages. For example there is on the second page of music the number 2*-6*. And, following 54*, there are pages 54A*, 54B*, 54C*.
Many of the chants in Cantus Selecti were found as an appendix in (for example) the Antiphonale 1949, these appendix would of course had * page numbers (or similar) I suspect that the original typesetting for this book intended it as an appendix rather than a stand alone book.
To participate in the discussions on Catholic church music, sign in or register as a forum member, The forum is a project of the Church Music Association of America.