IT'S WORKING! (None of the different editions listed on Google Books were available; only the one had a snippet preview, all the others had not as much as a cover, not to mention a text excerpt.) Thank you so much!
Here's a rather entertaining article about the appearance of the Balzac characters [...]
That was the 'this article' I linked to in the initial post
(it was actually how I came across the entire thing in the first place, browsing Balzacien articles; I had originally set out Googling Rastignac and Courfeyrac in conjunction to see if anyone, anywhere, had ever conducted a proper scientific study of The Law Student And His Tendency To Not Go To Lectures, Like, Ever in nineteenth century French literature - it was the first hit; the second is you