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I agree. Some years ago, when my original copy wore out, I bought a new
copy as part of a set which also includes the following two books:
"The Elements of Grammar" by Magaret Shertzer, ISBN 0-02-015440-2, and
"The Elements of Editing, A Modern Guide for Editors and Journalists" by
Arthur Plotnik, ISBN 0-02-047410-5, both published by Macmillan
A third book, "The Elements of Technical Writing" by Gary Blake and
Robert W. Bly, ISBN 0-02-013085-6, also published by Macmillan, includes
a discussion of grammar. It is a good handbook for all kinds of writing,
not just tech writing.