"Technical Symposium on Printed Circuits (1st : 1947 : Washington, D.C.)" . . . . . . . . "New advances in printed circuits; proceedings of the First Technical Symposium on Printed Circuits held October 15, 1947, in Washington, D.C., under the sponsorship of the Aeronautical Board and technical direction of the National Bureau of Standards"@en . . "New advances in printed circuits ; proceedings of the First Technical Symposium on Printed Circuits held October 15, 1947, in Washington, D.C., under the sponsorship of the Aeronautical Board and technical direction of the National Bureau of Standards" . "New advances in printed circuits proceedings of the First Technical Symposium on Printed Circuits held October 15, 1947, in Washington, D.C., under the sponsorship of the Aeronautical Board and technical direction of the National Bureau of Standards"@en . . . . . . .