SJR discipline rankings lists all of the journals in a discipline or subdiscipline based on their SJR. These rankings are available only through SCImago's website, scimagojr.com
To find rankings from the home page, click on "Journal Rankings", then select a Subject Area and/or Subject Category. Make sure it says "Order by: SJR" in the dropdown.
The list will also display the quartile ranking for each journal in the category, or which 25% the journal belongs to. The top 25% of journals in that category will show with a green Q1, then a yellow Q2 for the next 25% of journals, and so forth.
An individual journal title can also be searched for - clicking on an individual journal title will show all of the subject areas/categories it belongs to.
The ranked list from the Subject Category "Library and Information Science" is shown above.