The Los Alamos National Laboratory is conducting rock fragmentation research in oil shale to develop the blasting technologies and designs required to prepare a rubble bed for a modified in situ retort. The first section of this report outlines our experimental work at the Anvil Points Mine in Colorado with the Oil Shale Consortium sponsored by six major oil companies and managed by Science Applications, Inc. It details our proposed studies in explosive characterization and describes our progress in numerical calculation techniques to predict fracture of the shale. A detailed geologic characterization of two Anvil Points experiment sites is related to previous work at Colony Mine. The second section focuses on computer modeling and theory. One paper describes our latest generation of the stress wave code SHALE, its three-dimensional potential, and the slide line package for it. The second paper details how new bedded crack model calculations demonstrate agreement between predictions and field data. The final paper discusses a general stress-rate equation that takes energy dependence into account. 13 figures.