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WikiPedia: Khắc_acid http://link.library.utoronto.ca/hollar/ http://www.merriam-webster.com/dictionary/etching http://www.metmuseum.org/toah/hd/etch/hd_etch.htm http://www.moma.org/exhibitions/2001/whatisaprint/... http://libmma.contentdm.oclc.org/cdm/compoundobjec... https://catalogue.bnf.fr/ark:/12148/cb11935463p https://data.bnf.fr/ark:/12148/cb11935463p https://id.loc.gov/authorities/subjects/sh85045046 https://d-nb.info/gnd/4048166-9 https://web.archive.org/web/20070831113649/http://...