The current technology of the exploration and production segment of the petroleum industry is comprehensively reviewed by the Information Services Department of The University of Tulsa, and abstracts of pertinent articles and patents, domestic and foreign, are published in the weekly Petroleum Abstracts bulletin (approximately 15 000 abstracts per year). Format of the bulletin is such as to allow reprinting the abstracts on card stock for filing. Supplementing the current awareness aspects of the bulletin, an elaborate indexing system. based on controlled-vocabulary concept indexing, facilitates information retrieval from back files. Descriptors used to describe abstracted documents are listed together with extensive cross-indexing and hierarchical designations (broader or narrower terms) in an Exploration and Production Thesaurus. Monthly Alphabetic Subject Indexes are computer generated as searching tools, in which each abstract is cross indexed under multiple suitable subject headings. Supplemental alphabetic author indexes and numerical patent indexes are included. Cumulative indexes for the year are issued in June and December, the latter a hard-bound reference volume. At four-month intervals Dual Dictionary Coordinate Indexes (cumulative during the year) are published for retrieval by coordinate searching techniques. These same retrieval data are distributed on magnetic tape for automated computer searching.