Data On Number Pages In Papers Over The Years

For a while now I’ve trying to prove a perception of mine (and other folks too, I’m sure): scientific papers are getting much longer. I have the (strong) impression that papers now tend to have much more pages than years ago. If anyone knows of such a dataset with, say, titles of papers published by a journal during some years and then, attached to every paper, information like the number of pages.

I’d love to find data about STEM journals, but I’ll take any data that’s available.

​

Thanks.