SPECIAL SCIENTIFIC REPORTS 
This series comprises preliminary 
reports, progress reports, and reports of 
results of investigations of restricted 
scope, intended to aid or direct management 
or utilization practices, and as guides 
for administrative or legislative action. 
Issued in limited quantities for the use of 
Federal, State, or cooperating agencies, 
this series serves as an immediate outlet 
for findings of research and recommendations 
for prompt action. 
