6 DOCUMENTATION OF LITERATURE COMMISSION VI 
fication which was first published in 1876, and thus are not 
entirely modern in their classification of many arts and 
sciences, 
E, PREPARATION OF DOCUMENT CATALOGUE CARDS 
It is believed that document catalogue cards should be 
prepared according to the following specifications: 
a. Cards should be typewritten on 5 x 8 cards, using a style 
of presentation similar to that illustrated by Figure 1l. 
b. Coverage should include books, patents, photographs, gov- 
ernment publications of all sorts, and periodical litera- 
ture regarding scientific and technical aspects of the 
graphic arts, cartography, photogrammetry, surveying, ae- 
rial reconnaissance, and the related arts and sciences. 
C. Abstracts should be prepared which indicate the contents 
and scope of the document and mention any facts that may 
have a reasonable possibility of making a useful contribu- 
tion, no matter how small, to the advancement of the re- 
lated arts and sciences or their practical application. 
d. Great emphasis should be placed upon thorough cross-refer- 
encing of the contents of each document, 
s i: 7577 :..4 $42 
e, Abstracts may contain bracketed /  / opinions and criti- 
cisms prepared by the abstractors. 
In preparing the abstract of a document, the abstractor 
should first read the document very carefully, preparing an 
outline of the subject as his reading progresses, Continual 
reference should be made to the decimal and alphabetical in- 
dexes (See Appendices A and B) in order to determine: 
a. The proper terminology that should be used in writing the 
abstract, 
b. The appropriate subject-matter classification that should 
be used in classifying and cross-indexing the document 
catalogue card. 
It is desired that each abstract should be written as concise- 
ly as possible; and that it should provide the following in- 
formation regarding the original document: 
  
      
    
     
    
    
     
    
     
   
    
    
    
    
    
   
      
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