Plague from Space
Harry Harrison
If
The Year 2000
The Centauri Device
M. John Harrison
Tomorrow, the Stars
Robert A. Heinlein
Robert A. Heinlein & Frederik Pohl & Judith Merril & Truman Talley & Walter Bradbury
Double Star
Holding Wonder
Zenna Henderson
The Anything Box
There Was a Garden
Lord Randy, My Son
Joe L. Hensley
The Dragon in the Sea
Frank Herbert
The Probable Future
Alice Hoffman