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PREFACE 
After each International Congress of Photo- 
grammetry, the professional world awaits 
impatiently the publication of the Archives 
containing the Congress Reports. In general, 
however, they appear with a great delay, unfor 
tunately, often, of several years. The reasons 
for this are various. The fixed deadlines are 
seldom kept by the authors; many publications 
often arrive only during the Congress, some 
times even much later. The number of the 
copies sent ist frequently insufficient; the 
prescribed format is not always observed. The 
information concerning the Commissions and 
Working Groups is frequently missing or is 
incorrect, etc. This shows that the task of the 
Editors of the Archives is never an easy one 
and certainly not to be envied. 
The organizers of the Xlth International Con 
gress of Photogrammetry tried to overcome all 
these difficulties more rapidily than is usual 
and to despatch, at least, the National and 
General Commission Reports, Invited and Pre 
sented Papers as soon as possible. 
The Xlth International Congress in Lausanne 
was no exception in respect of the difficulties; 
on the contrary, the mass of received contribu 
tions surpassed, this time, all previous expe 
rience. After the Congress, 26 tons of paper had 
first to be put into order, then to be registered 
and prepared for the binding. The papers re 
ceived now fill 9 Parts of Volume XVII of the 
Archives. 
Due to the heterogeneity of the contributions, 
the Commission of Archives had to take the 
decision not to bind the publications in the 
usual way, but to screw them between covers. 
This form has the advantage that dissimilar 
formats can easily be included without having 
to be cut. The known disadvantages of the till 
now usual binding of the publications, which 
consist partly in leaflets and partly in rigidly 
bound brochures, could be remedied by per 
foration and screwing. The screwing also offers 
the advantage that the user can remove im 
portant individual papers if he wishes. 
The XVIIth Volume of the Archives is divided 
into 10 Parts. The 1st Part will contain the 
Minutes of the Congress debates in Lausanne 
(Council, Delegates, General and Plenary Ses 
sions, Commission Meetings), reports on all 
the Congress Events and the Exhibition, lists 
of the members and of the Congress partici 
pants, the new statutes and general informa 
tion. The 1st Part will be prepared by H. Harry 
and H. Kasper and can only appear in bound 
form at a later date but, in any case, in 1969. 
This later appearance is due to the volume of 
work involved in the transcription of the tape 
records, the checking of the texts by the Com 
mission Presidents and Secretaries, the printing 
and the binding. The Parts 1 to 4 form Edi 
tion A, the Parts 1 to 10 Edition B. 
The 2nd Part contains the National and Gene 
ral Commission Reports, the 3rd and the 4th 
the Invited Papers. In Part 5 the Presented 
Papers of Commissions I and VII are assembled. 
In Parts 6 and 7 are the Presented Papers of 
Commission II, in Part 8 those of Commis 
sion III, in Part 9 those of Commission IV and 
finally, in Part 10, the Presented Papers of 
Commissions V and VI. 
Each Part starts with its table of contents; the 
publications carry on their title sheet an order 
number and an indication to which Commis 
sion or Inter-Commission Working Group they 
belong. All the copies of Archives are number 
ed consecutively from 1 to 800. Delivery takes 
place following receipt of orders. If consignees 
discover that certain papers indicated in the 
table of contents are missing, this is not due to 
an omission of the despatches, but to the fact 
that an insufficient quantity was at their dispo 
sal. There are for instance National Reports 
of which only 50 copies were available at the 
time of the inventory after the Congress. It is 
supposed that too many copies were distri 
buted to the visitors of the Congress so that an 
insufficient number was left for the Archives. 
This concerns primarily those consignments 
which were only received in Lausanne during 
the second half of the Congress and were often 
distributed in duplicate—by the authors them 
selves as well as by the management of the Con 
gress—in the postal boxes of the Congress par 
ticipants. After the Congress, it was unfortuna 
tely impossible to remedy such errors. 
It was first intended to order alphabetically the 
Presented Papers according to authors for the