Book excerpt: The 5th edition of Langenkamp's Handbook of Oil Industry Terms & Phrases is the most comprehensive source of its kind. With more than 1,000 additional entries to its credit--more than 4,200 entries in all--this new reference contains expanded coverage of directional drilling, geophysical, and computer-related terms. Incorporating the latest methodology and technology, Handbook of Oil Industry Terms & Phrases is a must for all petroleum professionals, regardless of their level of knowledge and industry segment.