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No purchase necessary to enter or to win a prize. A purchase will not increase an entrant’s chances of winning. All applicable federal, state, local and municipal laws, rules, and regulations apply. Void where prohibited by law. Open only to legal U.S. residents, residing in the 50 United States and District of Columbia, who are 18 years or older as of date of entry. Internet access and Twitter account are required to enter. By participating, Entrants agree to…
Phosphate
Walter K. Dodds and Clay Randel
1992
Heavy Metals
Jenkins, David and Larry L. Russell
1994