Language. 
The bibliography is tri-lingual with English as its main language: abstracts are 
made in the original language of the publication if this is English, French or Ger- 
man. Articles written in other languages are abstracted or translated into English; 
in addition some of the most important French and German abstracts are also trans- 
lated into English. 
Period of time covered and number of abstracts per year. 
The bibliography covers all publications as from January 1958.In addition,the most 
important articles published before that date are included. 
The number of abstracts published per year depends, in first instance, on the num- 
ber of photogrammetric publications per year. In 1958 and 1959, whilst making the 
start, 500 titles ( approx. 1500 cards ) were published; in 1960 we will publish 
another 500 titles and , for the future s we expect to publish over 500 titles per 
year. 
H 
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CLASSIFICATION. 
Because no good classification of Subjects in photogrammetry existed yet,a logical 
Scheme suitable for universal use had to be developed. After careful screening of 
S 
the possibilities the Universal Decimal Classification (UDC) was chosen.Its section 
"Astronomy, geodesy, surveying" is being revised by the Féderation Internationale 
de Documentation in cooperation with the Institut für Angewandte Geodasie, its 
Section "Photogrammetry" in cooperation also with the ITC. Although this classifi- 
cation was not yet definite and was liable to change in certain respects before its 
final acceptance in 1961, we felt that the bibliography should be started without 
further delay. Thus, we published a preliminary edition marked "p" in the Subject 
heading; we expect that the edition may become definite in 1961. An outline of the 
classification used in the bibliography is given in appendix. 
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