You're using the wrong documentation. The Adams 729 refers to Adams, NE using PRECANCEL TYPE 729 (it has nothing to do with the Scott Catalog numbers). In this case, Adams, NE is only known to have a Type 729 style of precancel.
Keep in mind there could be a whole series of stamps (or various denominations of stamps within a given series) that may contain a Type 729 precancel. I believe the intention of the album is to provide one single space for displaying a stamp showing a DIFFERENT precancel type known for each city or town. If you were to expand the album to provide spaces for every precancel type known for each city or town, and then expand it to cover every denomination stamp in which that same precancel were used, the album would become huge and unmanageable.
You probably should download this PSS Style Chart that will help you identify the various Town and Type precancels known for any given town:http://precancels.com/wordpress/wp-...dium-res.pdf