□ - 1-15 April 
0 * 6-31 April 
0= 0 bird* 
@= 1-10 ■ 
0-11-25 * 
0-26-50 • 
O- 50-100 " 
■ 101 - 500 " 
■ 500 + 
APRIL 
SI-MNH-38 (Riv. 9-65) 
