The United States Holocaust Memorial Museum is in “a race against time” to collect the evidence of the Holocaust, urging New Englanders to donate artifacts before the last generation of survivors is gone. With the war-time generation dwindling, the museum is trying to rescue as many documents, photos, films and other Holocaust-era material as possible while the artifacts are still out there. “We’re really in a race against time to collect Holocaust artifacts,” said former Boston City Councilor Mike Ross, whose late father Stephan survived 10 concentration camps and was liberated by American soldiers at Dachau, Germany. “He (Stephan) spoke...