Blue book and Yellow pages

Blue book noun - A register of persons who are socially prominent.

Yellow pages and blue book are semantically related. in guide topic. In some cases you can use "Yellow pages" instead a noun phrase "Blue book".

Yellow pages noun - A telephone directory or section of a directory (usually printed on yellow paper) where business products and services are listed alphabetically by field along with classified advertising.

Blue book and yellow pages are semantically related. You can use "Blue book" instead a noun phrase "Yellow pages".