Quality phase 101o year decision [source_undated]: consulted source supplies no defensible manifestation year; exact publication year intentionally left unset.
Quality phase 481: Thimm confirms three etchings and a limitation of one hundred copies.
Digital Witnesses
Thimm bibliography — phase 481 edition 132
CataloguePDF
Thimm bibliography · open
Research witness linked in quality phase 481 (50-edition batch).