TY - RPRT TI - Preliminary results of prospecting of the "leached" zone over phosphate deposits in NW 1/4 of sec. 9, T. 31 S., R. 25 E., Polk County, Florida AU - Robert H. Stewart PY - 1949 DO - 10.3133/tei100 UR - https://pubs.usgs.gov/publication/tei100 ID - tei100 ER -