The expression "Yellow Pages" is an International standard &
"the one and only" term used for Business Directories all around the World.
Yellow Pages = Search by Activity (Companies)
classification by Business Sections (Accountant ... Zoo).
White Pages = Search by Name (People and Companies)
classification by Alphabet (A,B ... Z).
The expressions "Yellow Pages" and "White Pages" first appeared in the late 1880s in the US cities Cheyenne and Chicago
just a view years after Alexander Bell had invented the phone, Thomas Edison the light bulb
and while Gustave Eiffel was working on the construction of the Eiffel Tower ...
Little by little Yellowpages appeared in other places ....