|
3
|
|
Geographical positions -- Computer-assisted instruction. : Sheep-dog trial / programmed by Bevan Leviston ; program designers, Rosanne Gare and David L. Smith
|
1984
|
1
|
|
4
|
|
Geographical positions -- Congresses : Workshop on Positioning, Navigation, and Communication
|
|
1
|
|
5
|
|
Geographical positions -- History : Zero degrees : geographies of the Prime Meridian / Charles W.J. Withers
|
2017
|
1
|
