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COMMISSION VI DOCUMENTATION OF LITERATURE 9 
APPENDIX A 
A MODIFIED DECIMAL CLASSIFICATION 
It is believed that the following medification of the 
Dewey and Universal decimal classifications will provide for 
an orderly arrangement of all the various classifications of 
catalogue cards that are of interest to photogrammetrists, 
This modification is required by the fact that t 
he standard 
decimal classifications do not properly classify photogram- 
metry, cartography, and the graphic arts. It should be noted 
that this system provides a detailed classification of those 
subjects of special interest to photogrammetrists. On the 
other hand, this same classification systems provides a broad 
but sufficiently adequate classification for all 
other mate- 
rial on hand concerning subjects of lesser future value to 
photogrammetrists. A further expansion of this 
field of human interest can be obtaned from the 
Federation of Documentation, Willem Witsenplein 
hage, Holland. 
system in any 
International 
6, 's-Graven- 
In order to meet the present requirements of most photo- 
grammetrists, it is believed that a file of document catalogue 
cards should be subdivided into convenient fields of interest. 
In order to indicate appropriate subdivisions, the following 
decimal classification has been physically divided into ap- 
proximately forty parts. The resulting file of 
alogue cards can be further subdivided at any time by any user 
without altering the decimal classification or the classifica- 
tion of the document catalogue cards. 
The following sub-divisions of this Decimal Classification 
will be of special interest to experts in the fields of cartog- 
document cat- 
raphy, surveying, the graphic arts, and photographys 
050 Photogrammetry periodicals 
060 Photogrammetry associations and congresses 
526,8 Cartography 
526,9  Topograhical surveying 
526.91 Ground surveys 
526.92 Photogrammetry 
. "00 Graphic arts 
770 Photography 
777.03 Aerial photography 
777,07 Photography for terrestrial surveys 
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