TY - RPRT TI - Spectrographic analyses of insoluble-residue samples, Harrison 1 degree x 2 degrees quadrangle, Missouri and Arkansas : drill holes nos. 55, 56, 57, and 58 AU - Barbara Chazin AU - M. S. Erickson PY - 1988 DO - 10.3133/ofr88447 UR - https://pubs.usgs.gov/publication/ofr88447 ID - ofr88447 ER -