Trethowan, Stanley C. <br/><br/>
Manual of river and lakemanship / 
S.C. Trethowan. 
 - Harare :  Government Printer,  [?] 
 - 124 p. :  ill. ;  21 cm. 
<br/><br/> At head of title:  Zimbabwe inland waters. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Inland navigation--Law and legislation--Zimbabwe.<br/>Navigation--Safety measures.--Zimbabwe<br/>Waterways--Handbooks, manuals, etc.--Zimbabwe