82 DISCUSSION ON THE BIBLIOGRAPHY 
tions is an international bibliography of photo- 
grammetry. Such a bibliography was started in 
1958 and is now available to all photogramme- 
trists. I will point out its main characteristics 
right now. 
In order to fill this need in literature, Profes- 
sor Schermerhorn offered to the International 
Society of Photogrammetry in 1955 the assist- 
ance of the ITC, and in 1956 the resolution of 
the International Society requested us to carry 
out this proposal. We started in 1957 by setting 
up a classification of subjects in aerial survey, 
together with the Institut für Angewandte Geo- 
däsie in Frankfurt. In 1958 we actually started 
the preliminary edition of this bibliography of 
photogrammetry in co-operation with national 
societies in various countries. 
The basic function of literature screening and 
abstracting is carried out by colleagues and 
collaborators in the various countries. Abstracts 
are made by our colleagues — sometimes collab- 
orating in national abstracting committees — of 
all photogrammetric publications edited in that 
particular country. These entries are sent to the 
ITC where they are classified, translated if 
necessary, processed, edited, printed and distrib- 
uted. 
As to the edition, the bibliography is edited 
in the form of a card index, international library 
size 75 X 125 mm. Examples are shown here. 
They carry all abstracts of publications of 
interest to photogrammetrists. The card ab- 
stracts are accessible through a multiple entry: 
that is, according to author, to subject dealt 
with, and various points of view according to 
which the publication has been written. For that 
reason, each title is printed on more than one 
card. On the average, we need three cards per 
publication, per title. This appears once in 
alphabetical order in the “author set", and in 
decimal classification order in the “subject set”, 
in as many copies as there are subjects and 
points of view in the subject heading. 
All publications which are generally or 
publicly available are screened: that is, books, 
journals, theses, reports and patents from any 
country; also in the Slavic languages, Russian 
and so on. 
The content of this bibliography is intended 
to cover the complete theory and all important 
techniques and applications of photogrammetry 
and aerial survey. Examples of related items are: 
survey flight and navigation, aerial photography, 
orientation and mapping techniques, photo- 
grammetric methods, instruments and control; 
optics, photography, mathematics, electronics 
and automation as far as they are related to 
photogrammetry; photo-interpretation and en. 
gineering techniques, geography, forest inven. 
tory and management, photogeology, soil sur. 
vey, regional planning, civil engineering, re. 
connaissance, and other applications; research, 
education, international relations and space 
photogrammetry; and so on. 
On the matter of languages, the bibliography 
is tri-ligual with English as its main language | 
Abstracts are made in the original language of | 
the publication if this is English, French or 
German. Articles written in other languages are 
abstracted or translated into English. In addi- 
tion, some of the most important French and 
German abstracts are also translated into 
English. 
As to the matter of the period of time covered 
and the number of abstracts per year, the biblio- 
graphy covers all publications as from January 
1958. In addition, the most important articles 
published before that date are included. It is 
clear that the number of abstracts published per 
year depend in the first instance on the number 
of photogrammetric publications per year. In | 
1958 and 1959, whilst making the start, 500 
titles — approximately 1,500 cards — were pub- 
lished. This year, in 1960, we shall publish 
another 500 titles. For the future, we expect to 
publish over 500 titles per year. 
Because there existed no good classification 
of subjects in photogrammetry, a logical scheme 
suitable for universal use had to be developed | 
first. After careful screening of the possibilities, 
the Universal Decimal Classification - UDC - 
was chosen. Its section “Astronomy, geodesy, 
surveying" is being revised by the Fédération | 
Internationale de Documentation in co-opera- 
  
  
tion with the Institut für Angewandte Geodäsie; 
its section “Photogrammetry” in co-operation 
with the ITC at Delft. Although this classifica- | 
tion wat not yet definite in 1957/1958, and was | 
liable to change in certain respects before its 
final acceptance — probably 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 this edition may become definite in | 
1961. More than one card is printed for each 
title, as I have already indicated. Of course, one 
is intended for the “author set” and the others 
for the “subject set”. On the author card, the | 
name of the author is underlined by us, and this 
card should be filed alphabetically. On the | 
subject cards, each classification number i5 
underlined by us on a different card, thus 
enabling the subject cards to be placed in their | 
proper place. 
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