TY - RPRT TI - Spectrographic analyses of insoluble-residue samples, Harrison 1 degree x 2 degrees Quadrangle, Missouri and Arkansas; drill holes nos. 26, 27, and 28 AU - M. S. Erickson AU - Barbara Chazin PY - 1987 DO - 10.3133/ofr87523 UR - https://pubs.usgs.gov/publication/ofr87523 ID - ofr87523 ER -