18 

 16 



s NO DATA 

 '' JUN.-DEC.., 



\ /day\ / 



\ 



A "1 



\ 



/ 



\ NIGHT 



J L 



/ 



\ 



J 



J L 



1963 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 



YEAR 



Figure 2.— Summary of observation effort, 1962-78, in terms of total day. night, and total overflights of block areas. 



2 Schools 



Bonito 

 10 Tons each 



ENTERS OF SIGHTINGS 



Figure 3.— Graphic description of positioning the center of sighting. 



17 



