Open access journals in Library Literature

I did a quick review of how many open access journals are covered in the Wilson database, Library Literature and Information Science Index (Library Lit). For the list of open access journals in library and information science, I relied on a subject list in the Directory of Open Access Journals (DOAJ). I then looked Wilson's list of journals covered, which conveniently enough offered a field of data for each journal on whether it was open access. Here are the numbers:

Number of all journals in Library Lit.: 417
Number of open access journals in Library Lit.: 30
Number of open access journals in LIS in the DOAJ: 87

It is worth noting that the list of open access journals indexed in Library Lit. includes 13 titles that are not on the DOAJ list of LIS journals. Some of those 13 titles are now defunct. The open access journal, First Monday, is indexed by Library Lit, but the DOAJ lists it in the computer science category not the LIS one. I'm not sure why some of the still active OA journals that Wilson lists are not on the DOAJ site.

I've also marked up this copy of the DOAJ page of LIS journals to indicate which ones specifically are covered by Library Lit. It could be that the selection criteria used by DOAJ is more stringent, or it could just be that someone needs to suggest to DOAJ that these journals be added.

You may be wondering, "So, what's your point, Stephen?" I got started with this project because I was wondering how well OA journals were being indexed by the subscription databases we refer our students to. From the look of my little survey, Library Literature could be doing better. Are some subscription databases better than others for covering OA journals? If I want to search OA journals using a free web search engine, what would be the best one:

• Google Scholar
• Live Search Academic
  
• DOAJ: Find Articles
• OAIster
  

Is there something else I could be using freely? Is there instead a tool that will not only index OA journals but also content in OA repositories? I realize that there are a number of tools that are discipline specific; I'm looking for a way to search for OA content across the broadest possible range of disciplines. Any ideas?