Date (happened)
between 1 May 1972 and 31 May 1972
passage 542339 (lecture nid 1539), 'I will be here every Monday and Friday through the month of May'
Told / reported
28 April 1972
delivery claims on lecture nid 1539: catalogue #677 (certain) and an independent chrome dateline 'April 28, 1972' (certain), agreeing exactly