It is a refreshing and profitable undertaking to review from time to time the basic principles on which we work. Such meditation has a salutary effect in any case. If it finds no weakness in our armour we may take comfort; if there are features of which we are uncertain it is important to face up to these and see how they can be remedied. The writer does not claim to be in any way the most suitable person to carry out such a review; all that he can offer is a deep appreciation of the great progress in petroleum...

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