Secretariat of the Pacific Community English Style Guide

Description
From the Introduction:

This style manual has been written to help SPC authors produce documents for publication and is designed to establish a convention for style and grammar, streamline the editing process, and facilitate layout. It is not meant to cover every style and grammatical issue the SPC author may encounter. Volumes have been written on the subject. It is also impossible (not to mention unnecessary) to include every eventuality an author might run into. For many readers of SPC publications, English is not the first language. Therefore, one of the most important considerations in producing a publication is that it be written clearly, concisely, and without unnecessary words and phrases.