1
Published: 1933
Superior document: Directional effects in sound film processing 2
2
Superior document: Bell telephone system ...
3
Published: 1993
Superior document: Map / Geological Survey of Canada, Dept. of Energy, Mines and Resources : A 1828
4
Published: 1981
Superior document: Map / Geological Survey of Canada, Dept. of Energy, Mines and Resources : A 1521
5
Published: 1993
Superior document: Map / Geological Survey of Canada, Dept. of Energy, Mines and Resources : A 1838