Derwent patents manual
Subtitle: general
By: Derwent Publications Limited.
Contributors: Derwent Publications, Ltd.
Publisher: Derwent
Published: 1983
Place of publication: London ; McLean, Va
Language: eng
Subjects: Patent literature -- Information services.; Information storage and retrieval systems -- Patent documentation.
Notes: "Instruction Manual No. 1A".

ONLY LATEST EDITION IS KEPT.