1. The characterization of slope positions and their influence on the total nitrogen content of a few virgin soils of western Iowa;Aandahl;Soil Science Society of America Proceedings,1948
2. Representation of 3-D elevation in terrain databases using hierarchical triangulated irregular networks: A comparative analysis;Abdelguerfi;International Journal of Geographical Information Science,1998
3. Revealing and analysis of relief-forming wave-like deformations by a method of directional stacking with simultaneous frequency filtering (exemplified by the northeast of the Siberian Platform);Abelsky;Uchenye Zapiski NII Geologii Arktiki, Regional Geology Series,1969
4. Basic procedures for soil sampling and core drilling;Acker,1974
5. Experimental investigation into the accuracy of contouring from DTM;Ackermann;Photogrammetric Engineering and Remote Sensing,1978