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New Zealand

postage

1988, Jan 13 New Zealand electrification 100th issue wmk. multiple NZ & star (no perf info)

X

40c

multi

geothermal

Portugal

2018, Mar 19 Electricity in Portugal issue unwmk p. 13

-

1234

multi

geothermal

Liechtenstein

2010, Sep 6 Renewable energy issue p. 13.75

-

2.80fr

multi

geothermal

1 to 3 of 3