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Interesting Sidelights on the Work of the G.P.O.
  Lambert & Butler - 1939
  Reprinted 1999 - Card Collectors Society

Note:  Cards are approximately 1-3/8" x 2-5/8", "by courtesy of the Postmaster
General."  Many thanks to Kyle DeRoy for the original checklist!

No.   Title

  1   Salary Sheets Prepared by Machine
  2   The Speaking Clock
  3   International Telephone Exchange, London
  4   Trunk Calls: Check on Coins Inserted
  5   Automatic Exchange: The Selector
  6   Automatic Exchange: Intermediate Distribution Frame
  7   Automatic Exchange: Engineer Testing Dialling Speed
  8   Radio Telephone: Wick Coast Station Receiving Set
  9   Radio Telephone: Land's End Station Transmitter
 10   Radio Telephone: Control Room, Faraday Building
 11   Radio Telephone: Wick Coast Station Transmitting Set
 12   St. Valentine's Day Greetings Telegram
 13   Dog Detecting Cable Faults
 14   Alarm Clock Service
 15   Mobile Telepohone Exchange Van
 16   Police Telephone Pillar
 17   Laying Underground Cable: Mole Drainer at Work
 18   Central Telegraph Office Teleprinter Operator
 19   Phonogram Room
 20   Handing in Brokers' Telegrams, Threadneedle Street
 21   Teleprinters at the Derby
 22   Pneumatic Tubes, Central Telegraph Office
 23   Picture Telegraphy: Central Telegraph Office Sending Apparatus
 24   Telegraphs: Voice Frequency Equipment
 25   Telephone Repeater Station
 26   Automatic Telegram Conveyor
 27   Transfer of Cable from Lighter to Cable Ship
 28   Laying Cable Across Loch Awe
 29   Inland Air Mail
 30   Transorma Sorting Machines - A
 31   Transorma Sorting Machines - B
 32   Interior of Mobile Post Office, Seen from Above.
 33   Loading Christmas Mail for Alexandria into "Mercury"
 34   Parcel Sorting: Diverter Glacis
 35   Stamping Machine
 36   Counter Training School
 37   Printing Stamps 
 38   Reeling Rolls for Stamp Vending Machines
 39   Refilling Stamp Machine
 40   Mount Pleasant Parcel Office, Indian Section
 41   Drilling Sorting Holes in Postal Orders
 42   Postal Order Sorting Machines
 43   Savings Bank: Adrema Machines
 44   Savings Bank: Accounting Machine
 45   Wireless on Ships
 46   Croydon Airport: Direction-Finding Chart
 47   Rugby Radio Station
 48   Radio Interference: Portable Interference Locator
 49   Measuring Radio Interference
 50   G.P.O. Film Unit at Work