When Lucy promises Ricky in the episode “Lucy Goes to Monte Carlo” that she and Ethel will not go to the Casino, she picks up
a Michelin PARIS guidebook to find a restaurant. Of course she picks “Le Grille” that just HAPPENS to be IN the casino.

While maybe not the exact book, these are very close:

• https://www.etsy.com/listing/209559198/vintage-french-eiffel-tower-1956-paris
• https://www.etsy.com/listing/203130177/1965-michelin-map-of-greater-paris-and