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postage

1991, Jan 10 Parasitic plants unwmk (no perf info)

-	21c	multi	Harveya pulchra
-	35c	multi	Harveya speciosa
-	40c	multi	Alectra sessiliflora
-	50c	multi	Hydnora africana

1991, Apr 4 dolphins (1991)

-	25c	multi	Delphinus delphis
-	40c	multi	Tursiops truncatus
-	50c	multi	Sousa plumbea
-	60c	multi	Grampus griseus

1991, Jun 20 Endangered Birds (1991)

-	25c	multi	Balearica pavonina
-	40c	multi	Gyps coprotheres
-	50c	multi	Bugeranus carunculatus
-	60c	multi	Neophron percnopterus

1991, Sep 26 Famous People of Medicine (1991)

-	25c	multi	Emil von Behring
-	40c	multi	Camile Guerin and Albert Calmette
-	50c	multi	Jonas Salk
-	60c	multi	John Enders

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