H. N. Pfeiffer

• Dustfall and snow sampling survey in the vicinity of James River-Marathon Ltd., Marathon, 1988
• Snow sampling survey in the vicinity of Boise Cascade Canada Ltd., Kenora, February 1988
• Snow sampling survey in the vicinity of Kimberly-Clark of Canada Ltd. and Weldwood of Canada Ltd., Longlac, Ontario 1988
• Snow sampling survey in the vicinity of Minnova Inc., Schreiber, 1988