scope:

PREFACE

The Basic Petroleum Data Book - which was first published in October 1975- contains information compiled from a variety of secondary sources, as well as data collected by API.

Preliminary data are included in some tables in order to provide the most-timely information possible, and are identified as preliminary. Annual revisions are published as they become available. If any of these data are revised again in subsequent years, they are not included in this report unless they represent a major revision of the series.

For some data series, there are several agencies publishing similar information for various years. It should be noted that data maybe somewhat inconsistent from series to series due to differences in collection methods, sample sizes, etc.