Three articles appearing in the October 1965 edition of Geophysics, which was devoted to magnetic methods, deserve comment. These are papers by Steenland, Jensen, and Giret. Perhaps the following remarks will lead to better understanding of certain concepts in aerial magnetic surveying. All three authors discuss (and presumably advocate) the use of "high sensitivity magnetometers". This advocation has considerable merit in certain instances of petroleum exploration. However, each paper has certain oversights or omissions to which I will draw attention. I will also discuss certain other related subjects which seem pertinent.

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