"The letters in this frieze are taken from The Merrion Press edition of Steingruber's Architectural alphabet 1773, edited by Berthold Wolpe RDI."
'Architectonisches Alphabet' originally published: Schwabach : Johann David Steingruber, 1773.
Living in letters : ten alphabet palaces by Johann David Steingruber. ISBN 090356002X. Published by Merrion Press in 1975. Publication and catalogue information, links to buy online and reader comments.