Perforation type: 13 ¾x14

Subject:

40 cents. Energy of water - a mountain stream with a water wheel.

Additional:

Please, also look the Maxicard for this stamp

Topics: Irrigation and water wheels Stylized mills

Perforation type: 14x13 ¾

Subject:

58 cents. The energy of the air - a stylized wind generator

Additional:

Please, also look the Maxicard for this stamp and FDC for this issue

Topics: Stylized mills Wind turbines