Abstract: A printed sheet product comprises a thin core having a pair of opposing major planar sides. A plurality of sets of code fields are printed on a first side of the core. Each set of code fields is printed with a numeric code unique to the set. At least a first code field of each code field set is printed with the unique numeric code in at least a bar format. At least a second code field of each code field set is printed with the unique numeric code in at least a numeral format. The second code field of each set is spaced from the first code field of the set. A sheet product further comprises a layer of pressure sensitive adhesive applied to at least part of at least one side of the sheet product directly opposite at least part of at least one of the first and second code fields of each code field set printed on the first side of the core.