The Judas Valley By: Robert Silverberg and Randall Garrett

The Jupiter Weapon By: Charles Louis Fontenay

The K-Factor By: Harry Harrison

The Keeper By: H. Beam Piper

The King's Men A Tale of To-morrow By: Robert Grant

The King's Post Being a volume of historical facts relating to the posts, mail coaches, coach roads, and railway mail services of and connected with the ancient city of Bristol from 1580 to the present time By: Robert Charles Tombs

The Ladies Book of Useful Information Compiled from many sources By: Anonymous

The Land of Footprints By: Stewart Edward White

The Land of the Changing Sun By: Will N. (Will Nathaniel) Harben

The Lani People By: Jesse F. Bone

The Last Place on Earth By: Jim Harmon

The Last Supper By: T. D. Hamm

The Leader By: Murray Leinster

The Leech By: Robert Sheckley

The Leper in England: with some account of English lazar-houses By: Robert Charles Hope

The Library and Society Reprints of Papers and Addresses By: Arthur Elmore Bostwick

The Life of the Bee By: Maurice Maeterlinck

The Life of Trust: Being a Narrative of the Lord's Dealings With George Müller By: George Müller

The Life-Story of Insects By: George H. (George Herbert) Carpenter

The Lights of the Church and the Light of Science By: Thomas Henry Huxley

The Link By: Alan Edward Nourse

The Log of the Sun A Chronicle of Nature's Year By: William Beebe

The Long Voyage By: Carl Richard Jacobi

The Love of Frank Nineteen By: David Carpenter Knight

The Machinery of the Universe Mechanical Conceptions of Physical Phenomena By: Amos E. Dolbear

The Man from Time By: Frank Belknap Long

The Man the Martians Made By: Frank Belknap Long

The Man Who Played to Lose By: Laurence M. Janifer

The Man Who Rocked the Earth By: Arthur Cheney Train

The Man Who Saw the Future By: Edmond Hamilton

The Man With The Broken Ear By: Edmond About

The Manual of Heraldry; Fifth Edition Being a Concise Description of the Several Terms Used, and Containing a Dictionary of Every Designation in the Science By: Anonymous