TY - RPRT TI - Radioactivity of the Chattanooga shale East of the Mississippi River and South of the Ohio River: an interim report AU - J. M. Nelson AU - K.G. Brill PY - 1947 DO - 10.3133/tei22 UR - https://pubs.usgs.gov/publication/tei22 ID - tei22 ER -