Various tools for writers operated by the ReAnimus Press crew:

The Science Fiction Novel, by Basil Davenport, Robert A. Heinlein, C. M. Kornbluth, Alfred Bester, and Robert Bloch
Modern Science Fiction, by Reginald Bretnor, ed.

General:

In Search of Wonder, by Damon Knight
The Issue at Hand, by James Blish (as William Atheling, Jr.)
Heinlein in Dimension, by Alexei PanshinHeinleinHow To Improve Your Speculative Fiction Openings, by Robert QualkinbushAnthopology 101: Reflections, Inspections and Dissections of SF Anthologies, by Bud WebsterGalaxy Magazine: The Dark and the Light Years, by David L. RosheimSpace Travel - A Science Fiction WriterHaving Relationships With Characters on the Road to Great Fiction, by Andrew BurtSF in Dimension, by Alexei and Cory PanshinStaying Alive - A WriterMore Issues at Hand, by James Blish (as William Atheling, Jr.)Of Worlds Beyond, by Lloyd Arthur Eshbach, ed.Footprints on Sand, by L. Sprague de Camp and Catherine Crook de Camp