− | Direct indications of hydrocarbons—seen in [[drilling fluid]]s, cuttings, cores, or formation tests—may be of several types:<ref name=ch09r55>Schowalter, T., T., Hess, P., D., 1982, Interpretation of subsurface hydrocarbon shows: AAPG Bulletin, vol. 66, p. 723–760.</ref> | + | Direct indications of hydrocarbons—seen in [[drilling fluid]]s, cuttings, cores, or formation tests—may be of several types:<ref name=ch09r55>Schowalter, T., T., Hess, P., D., 1982, [http://archives.datapages.com/data/bulletns/1982-83/data/pg/0066/0009/1300/1302.htm Interpretation of subsurface hydrocarbon shows]: AAPG Bulletin, vol. 66, p. 723–760.</ref> |