A large increase in geophysical activity in the Rocky Mountain Area has occurred during the last few years. In the past, most of the activity has been seasonal because of adverse weather conditions during the winter months. However, growing competition has resulted in a tendency for geophysical crews to carry on operations throughout the winter. The authors review the performance of several crews which have had experience in winter work, summarize problems connected with winter operations, and discuss methods which have been developed to improve efficiency under these conditions.

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