- Middleton Advertising Company1
- Milner, Harold1
- Monk, Fred1
- Montgomery, Claud A.1
- Moore's Flower and Gift Shop (Columbia, S.C.)1
- Moredock, Will1
- Morton, Oliver F.1
- Motte, Florida1
- Mullan, Philip Mac1
- Nakao, Itaru1
- National Post Card Company1
- Nationwide Advertising Specialty Company1
- Olson, Robert S. "Bob" (interviewee)1
- Owens Brothers1
- Palmer, Benjamin1
- Palmetto Archives, Libraries and Museums Council on Preservation1
- Patterson, Neville1
- Perma-Ad-Ideas1
- Powell1
- Price Studios (Columbia, S.C.)1