Exhibit 10.20 STOCK OPTION AGREEMENT Stock Option Agreement made as of this 7th day of December, 2000 between Earth Sciences, Inc., a Colorado corporation, (hereinafter called the "Company") and John F. Wurster, whose address is 3815 Spring Valley...Stock Option Agreement • March 31st, 2003 • Earth Sciences Inc • Mineral royalty traders • Colorado
RECITALSJoint Product Exploitation and Marketing Agreement • March 31st, 2003 • Earth Sciences Inc • Mineral royalty traders • Tennessee
RECITALSDistribution Agreement • March 31st, 2003 • Earth Sciences Inc • Mineral royalty traders • Colorado
