I'm currently reading Double Worlds by Arne Zettersten. On page 161 he makes this reference "In the Tolkien Collection at the Bodleian Library, under item A 21/1–12, there is a series of essays or philological annotations from the period May–June 1913, and later." He continues by making references to the themes of some of these items. But not all of them. No direct quotes are made. I wonder if there is a way to search the Collection online in any way. And find out what other themes and topics in these and other manuscripts are discussed. When I search for Tolkien on this page I get only several hits, but I presume this is only a small tip of the iceberg. https://archives.bodleian.ox.ac.uk/agents/people/9028