Contact or lining paper for shelves has, it seems, become a thing of the past- it's something you'd see on Mad Men, not in a modern home. It's used to make cleaning the inside of wood cabinets easier, and to prevent cabinets from getting too dusty. Nowadays, contact lining is much less common than it used to be. Some people don't like the paste residue it can leave on their cabinets. It's generally not considered necessary, as long as you regularly clean and dust the inside of the cabinet. Hope this helps.