The following key items were checked in Nuclear Science Abstracts : 



(1) oceanography 



(2) radioisotopes 



(3) sand 



(k) tracer techniques (general, engineering, geology, 

 hydrology, and oceanography). 



All references derived from Ingle's monograph are indicated "by the 

 notation "Reference Ul." 



Some ninety-four citations are included in the bibliography . Cita- 

 tions 1 through 87 are arranged alphabetically in order of the senior 

 author's names. It was not possible to obtain the titles of citations 

 88 through 91, and these are presented as a separate group. Citations 

 92 through 9*+ are given without authors, having been obtained from 

 secondary sources (as references in other citations). 



A-18 



