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Web archiving will soon celebrate its 20th birthday. The community as a whole has collected large amounts of web content, providing a fertile ground for researchers to explore. Both the scope and techniques of web archiving are also fast expanding. Collaborative crawling, focused crawling, proactive crawling, and going beyond crawling are only a few approaches that the community is exploring.While growing and aggregating existing web archives, this international community is also improving archive usability, and incubating new user groups and new ideas. Thus, the community working on web archives includes social scientists, archivists, librarians, big data / information scientists, (web) technologists, and many others.Extended deadline : April 1st.The call for papers