Excellent illustrated map of Paris, by Lucien Boucher circa the 1940's. Found on the flickr photostream of Crossett Library (at Bennington College, Vermont), whose collection of images is well worth a visit.
As for Lucien Boucher (1889-1971) he was a poster artist and illustrator very active in the 20's, 30's and 40's. He made lithographs, engravings and painting in gouache and watercolour. Even though he is better known for his posters and maps, he's very much the poet laureate par excellence of everyday Paris in the mid-century period, with charming, evocative and droll vignettes of otherwise overlooked subjects.
For more, see:
Ma Brocante à Paris, which featured a smashing series pharmaceutical advertising in the guise of travel posters, including this one—
And A Journey Round My Skull, which includes Lucien Boucher's illustrations for children's books, in a round-up on that topic.
And, finally, Ma Galerie à Paris has a more comprehensive look at his life and work (in French). Here's an example—
Bonne journée, y'all!