飾Charles Sternberg

飾Female Grad Student

飾South Dakota Scienti

飾South Dakota Scienti

飾North Dakota Collect

飾North Dakota Collect

飾Male Grad Student (a

飾Pamela Everhart

飾Phosphate Mine Worke

飾Michael J. Everhart

飾Charles M. Sternberg

飾Dr. Betsy Richards

飾Road Worker

飾Levi Sternberg

飾Netherlands Scientis

飾Worker - Phosphate M

飾George Sternberg (vo

飾Phosphate Mine Forma

飾Martin

飾George Sternberg (60

飾Photographer

飾Camping Mother Voice

飾Camping Daughter (vo

飾Australian Scientist

飾Camping Daughter

飾Camping Father

飾South Dakota Scienti

飾George Sternberg

飾Australian Scientist

飾Reporter

飾Netherlands Scientis

飾Mom

飾North Dakota Collect