Make a copy of that note, so it will fit into both locations. The next step is to get these notes into a binder with separators for each location. Tape or glue your odd sized notes and clipped pages onto standard notebook paper to fit into a binder for that surname. Large notes, too big for the page, can be folded or slipped into a pocket separator. If you have original copies of birth certificates, letters, etc., it would be best to make copies of them and keep the originals in a safe, fireproof place.
Location is the key to genealogical research.
When your surnames are divided by location, patterns begin to emerge. If one of your surnames is uncommon, you may have followed suspicious trails when that surname showed up, and filing them by location will give you clues. It is written in a wonderfully humorous style, enjoyable and informative. Another organizing problem that genealogist run into is what to do with the discrepancies that crop up in their research. Sometimes the sources about a person's birthdate, or location, don't agree.