Decimal System for Classifying Data Pertaining to the Petroleum Industry

"The 'Decimal Classification' was first printed by the National Petroleum Publishing Company, publishers of National Petroleum News, in 1928. A second edition appeared in serial form in The Petroleum Engineer in 1938 and was later reprinted in booklet form. During the intervening years since it was first available, many persons apparently have found this system useful in meeting their filing problems. Articles printed in The Petroleum Engineer have for many years been numbered in accordance with this decimal classification to facilitate orderly clipping and filing.