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 Rogers In Times to Come / essay by The Editor The Analytical Laboratory: August 1941 / essay by The Editor Not Final! (Jovians #1) / by Isaac Asimov; interior artwork by Kolliker The Sea King's Armored Division (Part 2 of 2) / essay by L. Sprague de Camp Manic Perverse / by Winston K. Marks; interior artwork by Frank Kramer Two Percent Inspiration / by Theodore Sturgeon; interior artwork by Hubert Rogers Common Sense / by Robert A. Heinlein; interior artwork by Paul Orban Brass Tacks / essay by The Editor Letters / P. Schuyler Miller; Paul A. Carter; and E. Everett Evans