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In the field of lung biology, there is a large knowledge gap in understanding normal human lung development in late gestation and early childhood. Recent and ongoing advances in technology, visualization and analytical software, specifically applicable to molecular biology, have allowed both generation of vast amounts of data from smaller and smaller samples, down to single cells and organelles, as well as quantitative and unbiased analyses of transcripts, proteins, lipids, and epigenetics within and between cell populations leading to a deeper understanding of cell biology. In combination, advances in both macro- and micro- imaging of whole lungs and tissue sections are beginning to provide spatial relationship of well-defined cells within tissues with great resolution in multiple dimensions. The Molecular Atlas of Lung Development Program (LungMAP) has taken highly controlled and integrated approaches to develop molecular, cellular, and imaging data from non-diseased lungs across a range of pediatric ages to provide a resource for the general lung biology research community. Sample tissues from over 230 cases, including some with lung disease, are available for use by qualified researchers. Investigation of normal lung development and maintenance provides normative data and the opportunity to examine at a subcellular level how biology is disrupted in lung diseases including in BPD.