Re Mil-P-13949. The document is titled "Plastic Sheet, Laminated, Metal Clad (For Printed Wiring Boards), General Specification for." and as may be assumed by the title provides a technical description of several types of pwb laminate material. I believe the document is available (cost free) from the "Naval Publications and Forms Center (Attn: NPODS), 5801 Tabor Ave., Philadelphia, PA 1920-5099". I also thinke that for small orders (1 or 2 documents) the folks will accept orders via phone or Fax. Phone No. (voice line) = 215/697-2667 or 2179 and Fax No. = 215/697-2978. Hope this helps. JHM