Ivan Head Searching the Poetic   Eþandun: Epic Poem by William G. Carpenter, illustrations by Miko Simmons Beaver’s Pond Press, 2021, 252 pages, about $30   Abundance: New and Selected Poems by Andrew Lansdown Cascade Books, 2020, 225 pages, about $30   The Covid Chronicles by Roger G McDonald, paintings by Cally Lotz IM Directions, 2021, $25   Woodhenge by R L Swihart Gold Across the Water Books, 2020, 103 pages   A surgeon might specialise in one organ or bodily system and stay confined to a specialisation. A reviewer of poetry can deal with very different works on different…