1959
Two hardback copies, published by Oxford University Press, edited by Ursula Vaughan Williams and Imogen Holst, including a preface by them.
One copy is marked by Imogen Holst with queries and corrections.
One copy is inscribed 'For Iso with love from Imo and Ursula, November 1959', with some further notes on misprints. [111pp each]
2 vols.
Archive
https://www.bpacatalogue.org/archive/HOL-2-19-4