https://nabijaczleweli.xyz/content/blogn_t/022-Utah_v4.html
https://archive.org/details/utah-v4
v4tape/v4root/v4root.tar images/extracts of the V4 UNIX tape dump, derived from https://archive.org/details/utah_unix_v4_raw
cf. https://101010.pl/@nabijaczleweli/115760037106386835