TY - RPRT TI - National requirements for improved elevation data AU - Gregory I. Snyder AU - Larry J. Sugarbaker AU - Allyson L. Jason AU - David F. Maune PY - 2014 DO - 10.3133/ofr20131237 UR - https://pubs.usgs.gov/publication/ofr20131237 ID - ofr20131237 ER -