Outbreaks of the African migratory locust since 1871
Betts, E.
Outbreaks of the African migratory locust since 1871 - London 1961 - 28 p. - No. 6; Anti-Locust Research Ce .
Outbreaks of the African migratory locust since 1871 - London 1961 - 28 p. - No. 6; Anti-Locust Research Ce .