1. 1
   Vital statistics of the United States

   Cyhoeddwyd 1939

   Washington : United States Government Printing Office, 1939-

   Also issued on CD-ROM.

   Local Call Number: Llwytho...
   

   LLMC Digital
   

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2. 2
   Economic indicators

   Washington : U.S. G.P.O.

   Local Call Number: Llwytho...
   

   LLMC Digital
   

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   Ychwanegu at ffefrynnau
   

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