• Archie and Beryl Mercer, eds.

• St. Michael's, Bristol, Redruth, and Helston, Cornwall, England

• Nos. 1-29 in Marquette Hunnewell collection

• Nos. 2-16, 18-29 in The Tolkien Society archive

• A series of four posters was produced in the 1970/1971 time-frame seen here: Middle Earthworm Posters.

"Archie Mercer, a long-time fan from Cornwall, became British agent for the Tolkien Society of America and Niekas and also enjoyed his role. He put out a newsletter for British members, THE MIDDLE-EARTHWORM. Since he was also a great enthusiast of White's retelling of the Arthurian story he later changed the name to The Once and Future Worm." (Ed Meskys, The View From Entropy Hall #12)

Issues 1-18 were for British members of the Tolkien Society of America.

Issues
• 1 - October, 1968
• 2 - March, 1969
• 3
• 4 - 1969
• 5 - October, 1969
• 6 - November, 1969 - 6 pp.
• 7 - January, 1970 - 4 pp.
• 8 - March, 1970 - 6 pp.
• Middle Earthworm no. 9 - May, 1970 - 6 pp.
• 10 - July, 1970 - 10 pp.
• 11 - September, 1970 - 12 pp.
• 12 - 1970
• Middle Earthworm no. 13 - January, 1971, 12 pp.
• Middle Earthworm no. 14 - June, 1971, 12 pp.
• 15 - October, 1971 - 18 pp.
• 16 - February(March?), 1972 - 20 pp.
• 17 - June, 1972 - 20 pp.
• 18 - October, 1972 - 20 pp.
• 19 - February (January?), 1973 - 20 pp.
• 20 - June, 1973 - 20 pp.
• 21 - October, 1973 - 20 pp.
• 22 - February, 1974 - 20 pp.
• 23 - June, 1974 - 20 pp.
• 24 - October, 1974 - 20 pp.
• 25 - February, 1975 - 22 pp.
• 26 - August, 1975 - 16 pp.
• 27 - October, 1975 - 16 pp.
• 28 - February, 1976 - 16 pp.
• 29 - June, 1976 - 16 pp.
• Continues as The Once and Future Worm