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semipostal
1959, Sep 5 3rd Pan-American Games issue unwmk (no perf info)
| - | 20+10c | grn & blk |
1960, Jan 9 child welfare 1960 issue - birds (1960 Argentina) p. 13.5
| - | 20+10c | graybl | Vultur gryphus |
1970, May 23 Child Welfare 1970 issue - birds (1970) (no perf info)
| - | 20+10c | multi | Microstilbon burmeisteri |
1971, Feb 20 child welfare 1971 issue - fishes (1971 Argentina)
| - | 20+10c | multi | Salminus maxillosus |
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