1. Greenburg , L. 1922. A New Instrument for Sampling Aerial Dust, 2392Washington, D.C.: United States Department of the Interior, Bureau of Mines. Report of Investigations
2. Fieldner , A. C. 1921. The Sugar-Tube Method of Determining Rock Dust in Air, 278Washington, D.C.: U.S. Department of the Interior, Bureau of Mines. Technical paper
3. Brown , C. E. 1944. Filter-Paper Method for Obtaining Dust-Concentration Results Comparable to Impinger Results, 3788Washington, D.C.: U.S. Department of the Interior, Bureau of Mines. Report of Investigations
4. Use of Membrane filters in Air Sampling
5. American Conference of Governmental Industrial Hygienists (ACGIH). 1960. Air Sampling Instruments,, 1st edition, B–2–14. 15Akron, Ohio: ACGIH.