Foster, J. F., Beatty, G. H., and Howes, J. E. Interlaboratory cooperative study of the precision and accuracy of the measurement of lead in the atmosphere, using the colorimetric dithizone procedure.--Howes, J. E., Pesut, R. N., and Foster, J. F. Interlaboratory cooperative study of the precision of sampling stacks for particulates and collected residue.--Howes, J. E., Pesut, R. N., and Foster, J. F. Interlaboratory cooperative study of the precision and accuracy of the determination of oxides of nitrogen in gaseous combustion products (phenol disulfonic acid procedure) using ASTM method D. 1608-60. |