1. A new sampler for airborne pollen: The rotoslide;Ogden;J. Allerg,1967
2. Tagging and sampling ragweed pollen;Ogden,1960
3. The “fly-shield” rotobar: A simplified impaction sampler with motion-regulated shielding;Solomon,1968
4. Rotorod sampler with automatic retracting collector rods,1967