It's possible everything is out of copyright in the US. A very quick glance shows no evidence of renewal, and the URAA wouldn't have restored anything from life+50 Canada. There is a possibility of publication in renewed periodicals, in missed renewals, possibly even UK first publication, times each individual poem in a collection, so there'd be some need to tread carefully.--Prosfilaes (talk) 19:41, 5 October 2021 (UTC)