I have used CrossRef to extract metadata for a complete week of scholarship, starting on 20160601 until 20160607. I did this by manually constructing the CrossRef RESTful URLs (API) although since then it can be done better by
getpapers. This gets metadata for "everything" - books, "components", journal-articles, etc.
The coverage depends on what "publishers" submit. It is very probably weak on the Global South, on theses, and will be skewed to commercial publishers and large institutions.
Here's the scale for 7 days:
Treat this with caution as we haven't listed the types yet. I think some contributors don't deposit every day, but it gives an idea of the scale - 150K scholarly objects / week. I imagine that most/all have DOIs.
Here's an analysis of the
types in CrossRef. I imagine these are assigned by the publisher:
All these data will be published as CC0.
There were ca 1000 publishers during that one week; here are the leading 50. Again caution - we haven't normalized the names and some publishers may deposit irregularly. But there were some surprises for me. Divide by 7 to get the daily totals, and multiply by ~50 to get the yearly ones.
Informa UK Limited,9945
Public Library of Science (PLoS),6909
Cambridge University Press (CUP),6673
Walter de Gruyter GmbH,5383
Organisation for Economic Co-Operation and Development (OECD),3309
Institute of Electrical & Electronics Engineers (IEEE),2511
Virginia Tech Libraries,2429
Oxford University Press (OUP),2097
Brill Academic Publishers,1718
University of Arizona,1701
Royal Society of Chemistry (RSC),1454
American Chemical Society (ACS),1352
Ovid Technologies (Wolters Kluwer Health),1111
China Science Publishing & Media Ltd.,1108
Thieme Publishing Group,1054
Shanghai Institute of Optics and Fine Mechanics,929
Edward Elgar Publishing,889
Association for Computing Machinery (ACM),862
Harvard University Press,722
RCN Publishing Ltd.,587
eLife Sciences Organisation, Ltd.,564
American Physical Society (APS),523
American Scientific Publishers,494
American Society of Civil Engineers (ASCE),492
National Institute of Standards and Technology (NIST),484
OMICS Publishing Group,477