Quartzite sample
Quartzite sample 
Quartzite sample
Quartzite sample 
Quartzite sample
Quartzite sample 
Marble sample
Marble sample 
Marble sample
Marble sample 
Quartz samples
Quartz samples 
Quartz samples
Quartz samples 
Quartz samples
Quartz samples 
Quartz samples
Quartz samples 
Gypsum sample
Gypsum sample 
Gordon Paterson checking gasoline samples for the presence of sulphur in laboratory at the Imperial Oil refinery, Sarnia, Ontario.
Gordon Paterson checking gasoline samples for the presence of sulphur in laboratory at the Imperial Oil refinery, Sarnia, Ontario. 
Hornfels sample
Hornfels sample 
Feature on making gunpowder, Calgary, Alberta.
Feature on making gunpowder, Calgary, Alberta. 
ENGG 319 W1991
ENGG 319 W1991 
685
685 
1326
1326 
1416
1416 
739
739 
94
94 
177
177 
210
210 
1047
1047 
392
392 
1474
1474 
680
680 
703
703 
603
603 
361
361 
364
364 
933
933 
1056
1056 
1366
1366 
787
787 
114
114 
284
284 
345
345 
1288
1288 
369
369 
337
337 
456
456 
353
353 
162
162 
79
79 
704
704 
158
158 
335
335 
710
710 
263
263 
1036
1036 
of 178 
of 178 
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