TABLE OF CONTENTS 



Page 



Introduction 



Comment ] 



Section I— Location Charts 5 



Section ll—Schott's and Schultz's Analyses 15 



Section lll—Blegvad's Analysis 29 



Section IV— Emery's Analysis 33 



Section V—Dubach's and Wehe's Analysis 41 



Section VI— Recent Data Analysis 53 



Data Appendix 



Appendix A— Historical Data (Pre— 1950) 87 



Appendix 6— Recent Observations (Post— 1950) 103 



Bibliography 221 



