Via The Library of Congress:
New Science Reference Guide: United States War Department/Department of the Army Technical Manual (TM) Collection <http://www.loc.gov/rr/scitech/SciRefGuides/technicalmanuals.html>This inventory focuses on those War Department and Department of the Army Technical Manuals that were primarily received into the general collections of the Library of Congress from the 1940s to the 1970s. (After the mid-70's the Library no longer received this material.) A little over 300 titles were fully cataloged; individual volumes were received as serials with the TM number issued as the volume number, under the single Library of Congress classification "U408.3.A13."The Library of Congress does not have a complete set of these publications, but its holdings are extensive and significant. This inventory attempts to reveal the depth and breadth of the collection available to the researcher.