I saw this old postcard poem in my journal and felt it was a sort of Poetry Postcard Fest Ars Poetica. The “Rexroth” in the poem is Kenneth Rexroth. “Sam” is Sam Hamill who died on April 14, 2018, and showed up in many of my 2018 postcard poems:

746. Monkeywrenching Postcard for June Sanders, Milford, CA, July 9, 2018 by Paul E Nelson