Chemical laboratories

<No value> |  | 7 | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | [ | \
Robert Padgett

Caption: "Robert Padgett, chemistry instructor, completes an analysis of the soil for its physical and chemical characteristics. ..."