Last time I looked, in December 2017, not all of Mythlore: A Journal of J.R.R. Tolkien, C.S. Lewis, Charles Williams, and Mythopoeic Literature was online. But it appears that the entire run is now in PDF and online for free.

Note that the internal OCR of some words can throw off some searches. For instance, an internal site search for Earendel will not pick up the discussion of the early Earendel poems in the article “Niggle’s Leaves: The Red Book of Westmarch and Related Minor Poetry of J.R.R. Tolkien”. Yet a Google search of site:https://dc.swosu.edu/cgi/ will find it, as the Googlebot runs its own OCR on PDFs and the word occurs in the early pages of the article (the Googlebot sometimes doesn’t OCR all the pages).