“This nagging dilemma has come to be known as the excess sulfur problem... Just as atmospheric scientists were beginning to grasp the importance of a volcano's sulfur emmisions, solid earth scientists were finding that they had no idea where all this sulfur was coming from.”
Naked Earth: the New Geophysics (1995)
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Ronald Reagan, Time magazine (20 October 1980)
1980s
Source: Marco Brenna (2022) cited in: " Force ‘astonishing’: volcanologist https://www.odt.co.nz/news/dunedin/campus/force-%E2%80%98astonishing%E2%80%99-volcanologist" in Otago Daily Times, 17 January 2022.

As quoted in The Star (1959) and Morrow's International Dictionary of Contemporary Quotations (1982) by Jonathon Green.

interviewed by [Olivia Cox-Fill, For our daughters: how outstanding women worldwide have balanced home and career, Greenwood Publishing Group, 1996, http://books.google.com/books?id=UBqr_MEn4m4C&printsec=frontcover#PPA171,M1, 0-275-95199-5, 171]

Interviews: Ben Stein is Expelled! Christianity Today Movies, Christianity Today Movies: Interview with Ben Stein, 15 April 2008, 2008-04-18 http://www.christianitytoday.com/movies/interviews/benstein.html,