The authors wish to express appreciation to the many per- 

 sons who contributed to the success of the operation, but especially 

 to the engineers at the transmitting stations and the officers and 

 men of both ships. R. Gallenberger and R. Finkle, both of San 

 Diego State College, assisted in the data analysis. Mrs. Rita 

 Brown programmed the 1604 computer to predict skywave corrections. 



