The bibliography is divided into four main sections:Transformers, Insulation, Moisture and Oil. Each section is subdivided for easy reference. Failures caused by mechanical defects or by lightning have not been covered, since the factors which give rise to such failures are comparatively easy to identify and the steps necessary for correction or pre¬vention are more widely understood.nOn the next page is a list of the reference materials surveyed and of the years covered.
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