Publisher: Wikibooks 2010
From the table of contents: Introduction; Contents; Invention; Drafting; Revising; Editing; Proofreading; Narrative and Memoir; Creative Writing; Writing about reading; Public Affairs writing; Investigative writing; and more.
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by Garland Greever, Easley S. Jones - The Century Company
This handbook treats essential matters of grammar, diction, spelling, mechanics; and develops with thoroughness the principles of sentence structure. Larger units of composition it leaves to the texts in formal rhetoric. 
by Flora Klickmann - G. P. Putnam's sons
A book for would-be authors. No one can teach authors how or what to write; but sometimes it is possible to help the beginners to an understanding of what it is better not to write. For the rest I hope the book explains itself.
by Ilja van Roon - Lucid Communication
This book aims to improve your writing skills by teaching you how to use the principles of business writing. These principles - focus, purpose, meaning, substance, structure, clarity and humility - have been derived from the author's experiences.
by Katie Davis - Smashwords
This book has tips on how to write and publish a book for kids and advice on writing children's books. It has been compiled and edited by Katie Davis, Director of the Institute for Writers and the associated Institute of Children's Literature.