@book{ Solr-ocm08294277, title = {Operation manual for automatic dichotomous samplers : application to Beckman dichotomous samplers}, editor = {Spengler, John D.}, editor = {Environmental Sciences Research Laboratory. Atmospheric Chemistry and Physics Division}, editor = {Harvard School of Public Health. Dept. of Environmental Health Sciences}, publisher = {Environmental Sciences Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency}, year = {1981}, pages = {94}, }