Subseries contains electrical drawings, schematics, etc.

Sub-subseries contains Duckworth, Price, Henderson & Associates Ltd. electrical drawings (sepia diazotype)

Sub-subseries contains electrical drawings drawn by Canadian Westinghouse, Canadian General Electric, Foster Wheeler, and other.

Sub-subseries contains various electrical drawings (original pencil).

Sub-subseries contains various electrical drawings (original pencil).

Sub-subseries contains Falcon Engineering Company Ltd. electrical drawings. Drawn for Madison Natural Gas Co.

Sub-subseries contains Royalite electrical drawings.

Sub-subseries contains Duckworth, Price, Henderson & Associates electrical drawings. Drawn for Western Decalta Petroleum Ltd.

Sub-subseries contains Integrated Control Systems Ltd. electrical drawings. Drawn for Western Decalta.

Sub-subseries contains integrated Control Systems Ltd. electrical drawings. Drawn for Western Decalta Petroleum Ltd.

Sub-subseries contains Duckworth, Price, Henderson & Associates Ltd. Electrical drawings (original pencil). Drawn for Western Decalta Petroleum Ltd.

Sub-subseries contains Western Decalta Petroleum electrical drawings.