Contents:Documents for Tomorrow / essay by John W. Campbell Jr.By His Bootstraps / by Robert A. Heinlein (writing as Anson MacDonald); interior artwork by Hubert RogersIn Times to Come / essay by The EditorThe Analytical Laboratory: August 1941 / essay by The EditorNot Final! (Jovians #1) / by Isaac Asimov; interior artwork by KollikerThe Sea King's Armored Division (Part 2 of 2) / essay by L. Sprague de CampManic Perverse / by Winston K. Marks; interior artwork by Frank KramerTwo Percent Inspiration / by Theodore Sturgeon; interior artwork by Hubert RogersCommon Sense / by Robert A. Heinlein; interior artwork by Paul OrbanBrass Tacks / essay by The EditorLetters / P. Schuyler Miller; Paul A. Carter; and E. Everett Evans