Since a favorite thread on this list is compensation, I did a
little low-effort librarian work. This pertains only to the US,
so it parcochial & insular. Enschuldig,perdoname,pardon,
'scusa, and so on.
Anyway, the Dept of Labor publishes (paper, don't know about
on-line, my head is stuck in a previous time) the monthly
_Employment and Earnings_. The SUDOCS # is L 2.41/2:( ). A
frequent if not regular feature is the publication of
statistical series 39, "Median weekly earnings of full-time
wage ans salary workers by detailed occupation and sex." It is,
as it says, broken down by sex (yes, I know, this is an old social
scientist joke) and also aggregates the data.
Unfortunately, the closest "detailed occupation" is
"Librarians, archivists, and curators." There is a separate
subset for just "Librarians" . . . who as it happens are nearly
the sum total of the larger group.
Now this is not the most detailed and inclusive typology of
occupations that the USGov uses. I believe that the Census
Bureau has a much more extensive one (Census, as I recall, is
in DeptCommerce). On the other hand, it may be derived from a
Labor list.
Henry Grunder
Conservation/Preservation Coordinator
The Library of Virginia
  "I never heard of a young girl being ruined by a book." -
   H. L. Mencken