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PRELIMINARY DRAFT APPENDIX 7A: ADDITIONAL STUDIES OF ENVIRONMENTAL CONCENTRATIONS OF LEAD TABLE OF CONTENTS Page C. 1 GENERAL AMBIENT AIR CONCENTRATIONS............... ,,................. .........................

58 & * r u.s. d epar t men t o f c o mmer c e National Technical Information Sareice PFI-294 860 Lead Analysis of Ambient Air Particulates; Interlaboratory Evaluation of ERA Lead Reference Method (U.S.)