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"Positional uncertainty in manually digitized map data."
Paul V. Bolstad, Paul E. Gessler, Thomas M. Lillesand (1990)
- Paul V. Bolstad, Paul E. Gessler
, Thomas M. Lillesand:
Positional uncertainty in manually digitized map data. Int. J. Geogr. Inf. Sci. 4(4): 399-412 (1990)

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