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Filters: Author is Johannsen, O. A.  [Clear All Filters]
1941
Johannsen, OA, Butt FH.  1941.  Embryology of insects and myriapods. :xi+462.
1938
Riley, WA, Johannsen OA.  1938.  Medical entomology. :438pp.
1915
Riley, WA, Johannsen OA.  1915.  A handbook of medical entomology.

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