Pressmark and Shelf mark

Pressmark noun - A mark consisting of characters written on a book; used to indicate shelf location.

Shelf mark and pressmark are semantically related in number assigned to a book topic. In some cases you can use "Shelf mark" instead a noun "Pressmark".

Pressmark and shelf mark are semantically related in number assigned to a book topic. You can use "Pressmark" instead a noun phrase "Shelf mark".