Instructions found tables for the bilam humidity slide rule 

 - Nairobi :    East African Meteorological Department,    [n.d.] 
 - v. :    ill. ;    26 cm. 
 - East African Meteorological Department, Observor's manual ;    no. 1 9 .
<br/><br/><label>Subjects--Topical Terms: </label><br/> Meteorology -- Africa, East.<br/> Hydrometry.
<br/><br/><label>Gov. Doc. Class. No.: </label>G EAC M47 (08) 4/19