File: Beaver 
                                                    Ottei 
                                                    Manitoba  
 
 
 
 
"Observations on the Occurrence of Otter in the Riding Mountain 
 
National Park, Manitoba, in Relation to Beaver Life," by H. U. Green.

 
Canadian Field-Naturalist, Vol. XLVI, No. 9, December 1932, pp. 201206.