der quota can be estimated to be sometimes just 5 49. On 
the contrary, summaries of those papers are estimated to 
be read by a considerable larger number of colleagues. 
The following example might appear to be typical for this 
situation: An author published once a thorough scientific 
treatment af 30 pages in a special edition. A synopsis of 
2 pages on the subject was published in a periodical. One 
of the few experts in the field started controversial re- 
marks initiating a fruitful dispute. However, he based 
his remarks on the synopsis stressing he has had not as 
yet the time to study the lengthy publication. 
We are overflooded with printed material. Some collea- 
gues receive one periodical on any working day throughout 
the year. They have available less than one hour for look- 
ing through any periodical /1/. They read summaries of 
Scientific papers and look through the niews, reports and 
advertisements; sometimes they also read an article in 
full length. 
The photogrammetrio community is quite small. Therefore, 
periodicals of other countries must be read. 
Conclusions 
— Photogrammetric periodicals are absolutely necessary. 
— Monthly publication would be advantageous. 
— It will become inoreasingly difficult to finanoe exis- 
ting periodicals. 
— Two conditions are a prerequiste for the survical of 
scientific periodicals: sufficient print run /3.000 at 
least/ and sufficient income through advertisements. 
— For most countries there are just these two possibili- 
ties to achieve this: Either a photogrammetrio periodi- 
cal on a regional international basis, or a periodical 
on a national basis in cooperation with other fields, 
such as surveying or oartography. The latter solution 
is adopted in Australia, Austria, CSSR, GDR, Poland, 
Switzerland and others. It includes the great disad- 
vantage that the spreading of these publications is 
RS.