Health risk assessment covering the causes and studies of crystalline silica exposure from EPA's website (1996)
SAN FRANCISCO, CALIFORNIA June 5, 2014: It is important to read the label before adding sand to your child’s sandbox. Recent landmark legislation, the Consumer Product Safety Improvement Act (CPSIA), requires lead testing for playsand and all toys marketed to children.
Written by Jeanne Huber
OSHA's fact sheet about crystalline silica and silicosis. (2002)
Article from the New York Times (1988)
Article by Alex Miller, editor of Los Angeles Family (2005)