Alphabetical list of terms figuring in the ITC international bibliography of photogrammetry (IBP) and the universal decimal classification (UDC), as applied to the IBPʺ, with reference to their codes in the UDC / by H. L. RoggeExplanation of the geological maps of the Muñiesa - Oliete and Montalbán-Obón regionsThe ITC international bibliography of photogrammetry (IBP) (photogrammetric abstracts) and the Universal Decimal Classification (UDC) as applied to the IBP / by N.J.Wentink ; assisted for introd. and explanation byH.L. RoggeA short history of photogeology / by J. F. M. Mekel