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2. GUYTON H. G. PORTER R. AND LENSE F. T. 1955 Evaluation of soluble gelatin foam for possible use as a medium for sampling airborne microorganisms. Physical Defense Division Fort Detrick Maryland. Personnel Protection Branch Memorandum Report No. 19-55.
3. MITCHELL R. B. FULTON J. D. AND WILLINGTON H. V. 1953 A soluble gelatin-foam sampler for airborne micro-organisms at surface levels. USAF School of Aviation Medicine Unnumbered report.