CONTENTS 



Page 



I. INTRODUCTION 1 



A. Purpose 1 



B . Background 1 



C. Survey Area 2 



II. SURVEY OPERATIONS 3 



A. Conduct of Survey 3 



B. Control 3 



C. Instrumentation 3 



D. Personnel ^ 



III. DATA PROCESSING 5 



A. Preliminary Data Processing 5 



B. Magnetic Temporal Variations 5 



C. Total Magnetic Intensity Contour Chart 6 



D. Residual Magnetic Intensity Contour Chart 6 



E. Profiles 6 



IV. SURVEY RESULTS 7 



A. General 7 



B. Discussion of Data 7 



V. SUMMARY OF FINDINGS 11 

 REFERENCES 24 

 APPENDIX - Fredericksburg Magnetograms, July 18-24, 1961 25 



