Excerpt from The Nbs Lead Paint Poisoning Project: Housing and Other Aspects The mathematical model shown below has been used to estimate the number of children (n) in urban areas who have the elevated blood lead levels (ebl's) that are indicative of excessive body burdens of lead. D/h is the fraction of urban housing in the United States which is dilapidated; it essentially represents housing built before 1940. The factor f is the fraction of all children aged 1 to 6 who live in such housing and are likely to have elevated blood lead levels. C is the' About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.