"Alpine (N.J.)" . . "Cravath, Swaine & Moore." . . "Columbia University. Marcellus Hartley Research Laboratory." . . "Professional and personal files including Armstrong's correspondence with professional associations, other engineers, and friends, his research notes, circuit diagrams, lectures, articles, legal papers, and other related materials."@en . . "Agreements"@en . . "Biographies"@en . "Sound recordings"@en . . . . . . . "Regulations"@en . "Dockets"@en . . . . "Surveys"@en . "Checkbooks"@en . "Subpoenas"@en . . "Maps"@en . . "Annual reports"@en . . "Financial records"@en . . . "Audio cassettes"@en . . "Bills (financial)"@en . "Inventories"@en . "Insurance policies"@en . . "Audio tapes"@en . "Patents"@en . "Lectures"@en . . . . . . . "Bank statements"@en . . . . "Statistics"@en . . "Wills"@en . "Memoranda"@en . "Account books"@en . . . "Applications"@en . . . . "Manuals"@en . . . . "Notebooks"@en . . "Blueprints"@en . "Petitions"@en . "Briefs"@en . . "Slides"@en . . . "Scrapbooks"@en . . "Check stubs"@en . . "Graphs"@en . "Transcripts"@en . . . . . . . "Contracts"@en . "Photoprints"@en . "Photographs"@en . "Letters patent"@en . "Lantern slides"@en . . . . "Powers of attorney"@en . . "Reports"@en . . "Proceedings"@en . . . . . . "Notes"@en . "Articles"@en . . "Logbooks"@en . . . . . "Photonegatives"@en . "Bibliographies"@en . . "Glass plate negatives"@en . . . . . . "Abstracts"@en . "Edwin H. Armstrong papers"@en . "Clippings"@en . . . "Diagrams"@en . "Bylaws"@en . . "Releases"@en . "Indexes"@en . . . . "Charters"@en . . "Tax returns"@en . "Engineering drawings"@en . "Charts"@en . . . .