1. 1
   Classification : outline scheme of classes : revised to February, 1917

   出版 1917

   Washington : Government Printing Office, 1917.

   1 online resource (24 leaves)

   “...Government Printing Office,...”
   

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2. 2
   Classification

   出版 1910

   Washington : Government Printing Office, 1910.

   1 online resource (303 pages)

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3. 3
   Classification : outline scheme of classes : preliminary, December, 1909

   出版 1910

   Washington : Government Printing Office, 1910.

   1 online resource (24 leaves)

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4. 4
   Classification : outline scheme of classes : preliminary, revised to January, 1914

   出版 1914

   Washington : Government Printing Office, 1914.

   1 online resource (24 leaves)

   “...Government Printing Office,...”
   

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5. 5
   Classification. adopted 1898 : as in force January 1, 1902

   出版 1902

   Washington : Government Printing Office, Library Division, 1902.

   1 online resource (68 pages)

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6. 6
   Classification : outline scheme of classes

   出版 1907

   Washington : Government Printing Office, Library Division, 1907.

   1 online resource (22 leaves)

   “...Government Printing Office, Library Division,...”
   

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