Ratkevich assembled a team of volunteers and began securing the bones in the spring of 1995 ; excavations would only end in 1999 .
He informed the paleontologist of the Arizona - Sonora Desert Museum at Tucson , Ronald Paul Ratkevich .
Ronald Paul Ratkevich assembled a team of volunteers and began securing the bones in the spring of 1995 ; excavations would only end in 1999 .
He informed the paleontologist of the Arizona - Sonora Desert Museum at Tucson , Ronald Paul Ratkevich .