Polyurethane foam as trapping agent for airborne pesticides : analytical method development /

"Interagency agreement no. 78-D-XO449."

Guidelines for air sampling and analytical method development and evaluation /

Mode of access: Internet.

The infant school grammar, consisting of elementary lessons in the analytical method; illustrated by sensible objects and actions. Originally composed for Infant School No. 1 of New York.

Mode of access: Internet.