https://en.wikisource.org/w/index.php?title=Help:Page_scans&action=edit§ion=4 says
The following buttons appear for navigating and editing the Page: namespace
- previous page
- next page
- the Index for the page
- But I am not able to view them in sa,wikisource.org. eg. page https://sa.wikisource.org/w/index.php?title=%E0%A4%AA%E0%A5%83%E0%A4%B7%E0%A5%8D%E0%A4%A0%E0%A4%AE%E0%A5%8D:A_Sanskrit_primer_(1901).djvu/%E0%A5%A7%E0%A5%A6%E0%A5%A8&action=edit
- ~~~~