The ferric chloride etching of copper for photoengravings

I tiakina i:
Ngā taipitopito rārangi puna kōrero
Ngā kaituhi matua: Schaffert, Roland M (Author), Winkler, J. Homer (Author), Vaaler, Luther E (Author), Deubner, Russell L (Author)
Hōputu: Pukapuka
Reo:Ingarihi
I whakaputaina: Columbus Photo Engravers Research 1949
Ngā marau:
Ngā Tūtohu: Tāpirihia he Tūtohu
Kāore He Tūtohu, Me noho koe te mea tuatahi ki te tūtohu i tēnei pūkete!