I searched for “International Climate Science Coalition” as well “Tom Harris” in the following newspapers:
New York Times
Chicago Tribune
Washington Post
Wall Street Journal
Cleveland Plain Dealer
Philadelphia Inquirer
Boston Globe
Toronto Star
Star Tribune (Twin Cities of Minnesota)
Los Angeles Times
Ottawa Citizen
I only found two references to these searches. One was a letter from Tom Harris similar to the letter he submitted to the Duluth News Tribune; it was date 2015-05-01. The other was about a scientist connected to Harvard and the Smithsonian who wrote a paper skeptical of climate change. He didn’t disclose that he received funds from the oil industry. See
https://www.bostonglobe.com/news/nation/2015/01/26/harvard-smithsonian-climate-change-skeptic-accused-violating-academic-disclosure-agreement/Y1uMQ8yuLpYCjOHGckRArO/story.html
