X O 1 Reports from O.E.E.P.E.; time-table serial numbers 252, 251 and 133. 
X R 1 T. Rumboldt, Italy: Application de la photogrammétrie aérienne aux levers 
cadastraux des agglomérations bâties. 
X S 1 M. Santoni, Italy: Considerations on photogrammétrie plotting instru 
ments utilizing mechanical projection. 
X W 1 P. Wiser, Belgium: Procès-verbal de l’essai contrôlé № 1. 
X V2 J. S. Veenenbos, Netherlands: Aerial photo-interpretation and analysis for 
soil survey and land classification purposes.